diff --git a/Telegram/SourceFiles/boxes/stickers_box.cpp b/Telegram/SourceFiles/boxes/stickers_box.cpp
index 1b8ce6cbc..4cfb04451 100644
--- a/Telegram/SourceFiles/boxes/stickers_box.cpp
+++ b/Telegram/SourceFiles/boxes/stickers_box.cpp
@@ -35,6 +35,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/image/image.h"
 #include "ui/cached_round_corners.h"
 #include "window/window_session_controller.h"
+#include "media/clip/media_clip_reader.h"
 #include "main/main_session.h"
 #include "styles/style_layers.h"
 #include "styles/style_boxes.h"
@@ -143,10 +144,7 @@ private:
 			int32 count,
 			const QString &title,
 			int titleWidth,
-			bool installed,
-			bool official,
-			bool unread,
-			bool archived,
+			Data::StickersSetFlags flagsOverride,
 			bool removed,
 			int32 pixw,
 			int32 pixh);
@@ -154,6 +152,10 @@ private:
 
 		bool isRecentSet() const;
 		bool isMasksSet() const;
+		bool isWebm() const;
+		bool isInstalled() const;
+		bool isUnread() const;
+		bool isArchived() const;
 
 		const not_null<StickersSet*> set;
 		DocumentData *sticker = nullptr;
@@ -162,16 +164,14 @@ private:
 		int32 count = 0;
 		QString title;
 		int titleWidth = 0;
-		bool installed = false;
-		bool official = false;
-		bool unread = false;
-		bool archived = false;
+		Data::StickersSetFlags flagsOverride;
 		bool removed = false;
 		int32 pixw = 0;
 		int32 pixh = 0;
 		anim::value yadd;
 		std::unique_ptr<Ui::RippleAnimation> ripple;
 		std::unique_ptr<Lottie::SinglePlayer> lottie;
+		Media::Clip::ReaderPointer webm;
 	};
 	struct MegagroupSet {
 		inline bool operator==(const MegagroupSet &other) const {
@@ -221,6 +221,8 @@ private:
 	void setActionSel(int32 actionSel);
 	float64 aboveShadowOpacity() const;
 	void validateLottieAnimation(not_null<Row*> row);
+	void validateWebmAnimation(not_null<Row*> row);
+	void validateAnimation(not_null<Row*> row);
 	void updateRowThumbnail(not_null<Row*> row);
 
 	void readVisibleSets();
@@ -229,8 +231,12 @@ private:
 	void rebuildAppendSet(not_null<StickersSet*> set, int maxNameWidth);
 	void fillSetCover(not_null<StickersSet*> set, DocumentData **outSticker, int *outWidth, int *outHeight) const;
 	int fillSetCount(not_null<StickersSet*> set) const;
-	QString fillSetTitle(not_null<StickersSet*> set, int maxNameWidth, int *outTitleWidth) const;
-	void fillSetFlags(not_null<StickersSet*> set, bool *outInstalled, bool *outOfficial, bool *outUnread, bool *outArchived);
+	[[nodiscard]] QString fillSetTitle(
+		not_null<StickersSet*> set,
+		int maxNameWidth,
+		int *outTitleWidth) const;
+	[[nodiscard]] Data::StickersSetFlags fillSetFlags(
+		not_null<StickersSet*> set) const;
 	void rebuildMegagroupSet();
 	void fixupMegagroupSetAddress();
 	void handleMegagroupSetAddressChange();
@@ -1030,10 +1036,7 @@ StickersBox::Inner::Row::Row(
 	int32 count,
 	const QString &title,
 	int titleWidth,
-	bool installed,
-	bool official,
-	bool unread,
-	bool archived,
+	Data::StickersSetFlags flagsOverride,
 	bool removed,
 	int32 pixw,
 	int32 pixh)
@@ -1042,10 +1045,7 @@ StickersBox::Inner::Row::Row(
 , count(count)
 , title(title)
 , titleWidth(titleWidth)
-, installed(installed)
-, official(official)
-, unread(unread)
-, archived(archived)
+, flagsOverride(flagsOverride)
 , removed(removed)
 , pixw(pixw)
 , pixh(pixh) {
@@ -1062,6 +1062,22 @@ bool StickersBox::Inner::Row::isMasksSet() const {
 	return (set->flags & SetFlag::Masks);
 }
 
+bool StickersBox::Inner::Row::isWebm() const {
+	return (set->flags & SetFlag::Webm);
+}
+
+bool StickersBox::Inner::Row::isInstalled() const {
+	return (flagsOverride & SetFlag::Installed);
+}
+
+bool StickersBox::Inner::Row::isUnread() const {
+	return (flagsOverride & SetFlag::Unread);
+}
+
+bool StickersBox::Inner::Row::isArchived() const {
+	return (flagsOverride & SetFlag::Archived);
+}
+
 StickersBox::Inner::Inner(
 	QWidget *parent,
 	not_null<Window::SessionController*> controller,
@@ -1302,7 +1318,7 @@ void StickersBox::Inner::paintRow(Painter &p, not_null<Row*> row, int index) {
 	p.setPen(st::contactsNameFg);
 	p.drawTextLeft(namex, namey, width(), row->title, row->titleWidth);
 
-	if (row->unread) {
+	if (row->isUnread()) {
 		p.setPen(Qt::NoPen);
 		p.setBrush(st::stickersFeaturedUnreadBg);
 
@@ -1344,7 +1360,7 @@ void StickersBox::Inner::paintRowThumbnail(
 			row->stickerMedia->thumbnailWanted(origin);
 		}
 	}
-	validateLottieAnimation(row);
+	validateAnimation(row);
 	if (!row->lottie) {
 		const auto thumb = row->thumbnailMedia
 			? row->thumbnailMedia->image()
@@ -1380,6 +1396,7 @@ void StickersBox::Inner::paintRowThumbnail(
 void StickersBox::Inner::validateLottieAnimation(not_null<Row*> row) {
 	if (row->lottie
 		|| !ChatHelpers::HasLottieThumbnail(
+			row->set->flags,
 			row->thumbnailMedia.get(),
 			row->stickerMedia.get())) {
 		return;
@@ -1401,6 +1418,25 @@ void StickersBox::Inner::validateLottieAnimation(not_null<Row*> row) {
 	}, lifetime());
 }
 
+void StickersBox::Inner::validateWebmAnimation(not_null<Row*> row) {
+	if (row->webm
+		|| !ChatHelpers::HasWebmThumbnail(
+			row->set->flags,
+			row->thumbnailMedia.get(),
+			row->stickerMedia.get())) {
+		return;
+	}
+	row->webm = ChatHelpers::WebmThumbnail(
+		row->thumbnailMedia.get(),
+		row->stickerMedia.get(),
+		[=](Media::Clip::Notification) { updateRowThumbnail(row); });
+}
+
+void StickersBox::Inner::validateAnimation(not_null<Row*> row) {
+	validateWebmAnimation(row);
+	validateLottieAnimation(row);
+}
+
 void StickersBox::Inner::updateRowThumbnail(not_null<Row*> row) {
 	const auto rowTop = [&] {
 		if (row == _megagroupSelectedSet.get()) {
@@ -1429,7 +1465,7 @@ void StickersBox::Inner::updateRowThumbnail(not_null<Row*> row) {
 void StickersBox::Inner::paintFakeButton(Painter &p, not_null<Row*> row, int index) {
 	auto removeButton = (_isInstalled && !row->removed);
 	auto rect = relativeButtonRect(removeButton);
-	if (!_isInstalled && row->installed && !row->archived && !row->removed) {
+	if (!_isInstalled && row->isInstalled() && !row->isArchived() && !row->removed) {
 		// Checkbox after installed from Trending or Archived.
 		int checkx = width() - (st::contactsPadding.right() + st::contactsCheckPosition.x() + (rect.width() + st::stickersFeaturedInstalled.width()) / 2);
 		int checky = st::contactsPadding.top() + (st::contactsPhotoSize - st::stickersFeaturedInstalled.height()) / 2;
@@ -1516,7 +1552,7 @@ void StickersBox::Inner::setActionDown(int newActionDown) {
 					auto rippleMask = Ui::RippleAnimation::ellipseMask(QSize(rippleSize, rippleSize));
 					ensureRipple(st::stickersRemove.ripple, std::move(rippleMask), removeButton);
 				}
-			} else if (!row->installed || row->archived || row->removed) {
+			} else if (!row->isInstalled() || row->isArchived() || row->removed) {
 				auto rippleSize = QSize(_addWidth - st::stickersTrendingAdd.width, st::stickersTrendingAdd.height);
 				auto rippleMask = Ui::RippleAnimation::roundRectMask(rippleSize, st::roundRadiusSmall);
 				ensureRipple(st::stickersTrendingAdd.ripple, std::move(rippleMask), removeButton);
@@ -1649,7 +1685,7 @@ void StickersBox::Inner::updateSelected() {
 			selected = selectedIndex;
 			local.setY(local.y() - _itemsTop - selectedIndex * _rowHeight);
 			const auto row = _rows[selectedIndex].get();
-			if (!_megagroupSet && (_isInstalled || !row->installed || row->archived || row->removed)) {
+			if (!_megagroupSet && (_isInstalled || !row->isInstalled() || row->isArchived() || row->removed)) {
 				auto removeButton = (_isInstalled && !row->removed);
 				auto rect = myrtlrect(relativeButtonRect(removeButton));
 				actionSel = rect.contains(local) ? selectedIndex : -1;
@@ -1952,8 +1988,10 @@ void StickersBox::Inner::rebuildMegagroupSet() {
 	auto sticker = (DocumentData*)nullptr;
 	auto pixw = 0, pixh = 0;
 	fillSetCover(set, &sticker, &pixw, &pixh);
-	auto installed = true, official = false, unread = false, archived = false, removed = false;
-	if (!_megagroupSelectedSet || _megagroupSelectedSet->set->id != set->id) {
+	auto flagsOverride = SetFlag::Installed;
+	auto removed = false;
+	if (!_megagroupSelectedSet
+		|| _megagroupSelectedSet->set->id != set->id) {
 		_megagroupSetField->setText(set->shortName);
 		_megagroupSetField->finishAnimating();
 	}
@@ -1963,10 +2001,7 @@ void StickersBox::Inner::rebuildMegagroupSet() {
 		count,
 		title,
 		titleWidth,
-		installed,
-		official,
-		unread,
-		archived,
+		flagsOverride,
 		removed,
 		pixw,
 		pixh);
@@ -2095,13 +2130,14 @@ void StickersBox::Inner::updateRows() {
 			}
 		}
 		if (!row->isRecentSet()) {
-			auto wasInstalled = row->installed;
-			auto wasArchived = row->archived;
-			fillSetFlags(set, &row->installed, &row->official, &row->unread, &row->archived);
+			auto wasInstalled = row->isInstalled();
+			auto wasArchived = row->isArchived();
+			row->flagsOverride = fillSetFlags(set);
 			if (_isInstalled) {
-				row->archived = false;
+				row->flagsOverride &= ~SetFlag::Archived;
 			}
-			if (row->installed != wasInstalled || row->archived != wasArchived) {
+			if (row->isInstalled() != wasInstalled
+				|| row->isArchived() != wasArchived) {
 				row->ripple.reset();
 			}
 		}
@@ -2143,11 +2179,11 @@ int StickersBox::Inner::countMaxNameWidth() const {
 void StickersBox::Inner::rebuildAppendSet(
 		not_null<StickersSet*> set,
 		int maxNameWidth) {
-	bool installed = true, official = true, unread = false, archived = false, removed = false;
-	if (set->id != Data::Stickers::CloudRecentSetId) {
-		fillSetFlags(set, &installed, &official, &unread, &archived);
-	}
-	if (_isInstalled && archived) {
+	auto flagsOverride = (set->id != Data::Stickers::CloudRecentSetId)
+		? fillSetFlags(set)
+		: SetFlag::Installed;
+	auto removed = false;
+	if (_isInstalled && (flagsOverride & SetFlag::Archived)) {
 		return;
 	}
 
@@ -2176,10 +2212,7 @@ void StickersBox::Inner::rebuildAppendSet(
 		raw->count = count;
 		raw->title = title;
 		raw->titleWidth = titleWidth;
-		raw->installed = installed;
-		raw->official = official;
-		raw->unread = unread;
-		raw->archived = archived;
+		raw->flagsOverride = flagsOverride;
 		raw->removed = removed;
 		raw->pixw = pixw;
 		raw->pixh = pixh;
@@ -2200,10 +2233,7 @@ void StickersBox::Inner::rebuildAppendSet(
 			count,
 			title,
 			titleWidth,
-			installed,
-			official,
-			unread,
-			archived,
+			flagsOverride,
 			removed,
 			pixw,
 			pixh));
@@ -2289,20 +2319,12 @@ QString StickersBox::Inner::fillSetTitle(
 	return result;
 }
 
-void StickersBox::Inner::fillSetFlags(
-		not_null<StickersSet*> set,
-		bool *outInstalled,
-		bool *outOfficial,
-		bool *outUnread,
-		bool *outArchived) {
-	*outInstalled = (set->flags & SetFlag::Installed);
-	*outOfficial = (set->flags & SetFlag::Official);
-	*outArchived = (set->flags & SetFlag::Archived);
-	if (_section == Section::Featured) {
-		*outUnread = (set->flags & SetFlag::Unread);
-	} else {
-		*outUnread = false;
-	}
+Data::StickersSetFlags StickersBox::Inner::fillSetFlags(
+		not_null<StickersSet*> set) const {
+	const auto result = set->flags;
+	return (_section == Section::Featured)
+		? result
+		: (result & ~SetFlag::Unread);
 }
 
 template <typename Check>
@@ -2319,7 +2341,7 @@ StickersSetsOrder StickersBox::Inner::collectSets(Check check) const {
 
 StickersSetsOrder StickersBox::Inner::getOrder() const {
 	return collectSets([](Row *row) {
-		return !row->archived && !row->removed && !row->isRecentSet();
+		return !row->isArchived() && !row->removed && !row->isRecentSet();
 	});
 }
 
@@ -2394,7 +2416,7 @@ void StickersBox::Inner::readVisibleSets() {
 	int rowTo = ceilclamp(itemsVisibleBottom, _rowHeight, 0, _rows.size());
 	for (int i = rowFrom; i < rowTo; ++i) {
 		const auto row = _rows[i].get();
-		if (!row->unread) {
+		if (!row->isUnread()) {
 			continue;
 		}
 		if ((i * _rowHeight < itemsVisibleTop)
diff --git a/Telegram/SourceFiles/chat_helpers/stickers_list_widget.cpp b/Telegram/SourceFiles/chat_helpers/stickers_list_widget.cpp
index 3ff413bc7..778016663 100644
--- a/Telegram/SourceFiles/chat_helpers/stickers_list_widget.cpp
+++ b/Telegram/SourceFiles/chat_helpers/stickers_list_widget.cpp
@@ -38,6 +38,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/window_session_controller.h" // GifPauseReason.
 #include "main/main_session.h"
 #include "main/main_session_settings.h"
+#include "media/clip/media_clip_reader.h"
 #include "apiwrap.h"
 #include "api/api_toggling_media.h" // Api::ToggleFavedSticker
 #include "styles/style_chat_helpers.h"
@@ -97,6 +98,7 @@ struct StickerIcon {
 	uint64 setId = 0;
 	StickersSet *set = nullptr;
 	mutable std::unique_ptr<Lottie::SinglePlayer> lottie;
+	mutable Media::Clip::ReaderPointer webm;
 	mutable QPixmap savedFrame;
 	DocumentData *sticker = nullptr;
 	ChannelData *megagroup = nullptr;
@@ -157,6 +159,8 @@ private:
 		int newSelected,
 		ValidateIconAnimations animations);
 	void validateIconLottieAnimation(const StickerIcon &icon);
+	void validateIconWebmAnimation(const StickerIcon &icon);
+	void validateIconAnimation(const StickerIcon &icon);
 
 	void refreshIconsGeometry(ValidateIconAnimations animations);
 	void updateSelected();
@@ -792,6 +796,7 @@ void StickersListWidget::Footer::validateIconLottieAnimation(
 	if (icon.lottie
 		|| !icon.sticker
 		|| !HasLottieThumbnail(
+			icon.set ? icon.set->flags : Data::StickersSetFlags(),
 			icon.thumbnailMedia.get(),
 			icon.stickerMedia.get())) {
 		return;
@@ -817,6 +822,30 @@ void StickersListWidget::Footer::validateIconLottieAnimation(
 	}, icon.lifetime);
 }
 
+void StickersListWidget::Footer::validateIconWebmAnimation(
+		const StickerIcon &icon) {
+	icon.ensureMediaCreated();
+	if (icon.webm
+		|| !icon.sticker
+		|| !HasWebmThumbnail(
+			icon.set ? icon.set->flags : Data::StickersSetFlags(),
+			icon.thumbnailMedia.get(),
+			icon.stickerMedia.get())) {
+		return;
+	}
+	const auto id = icon.setId;
+	icon.webm = WebmThumbnail(
+		icon.thumbnailMedia.get(),
+		icon.stickerMedia.get(),
+		[=](Media::Clip::Notification) { updateSetIcon(id); });
+}
+
+void StickersListWidget::Footer::validateIconAnimation(
+		const StickerIcon &icon) {
+	validateIconWebmAnimation(icon);
+	validateIconLottieAnimation(icon);
+}
+
 void StickersListWidget::Footer::updateSetIcon(uint64 setId) {
 	enumerateVisibleIcons([&](const StickerIcon &icon, int x) {
 		if (icon.setId != setId) {
@@ -832,7 +861,7 @@ void StickersListWidget::Footer::paintSetIcon(
 		int x) const {
 	if (icon.sticker) {
 		icon.ensureMediaCreated();
-		const_cast<Footer*>(this)->validateIconLottieAnimation(icon);
+		const_cast<Footer*>(this)->validateIconAnimation(icon);
 		const auto origin = icon.sticker->stickerSetOrigin();
 		const auto thumb = icon.thumbnailMedia
 			? icon.thumbnailMedia->image()
diff --git a/Telegram/SourceFiles/chat_helpers/stickers_lottie.cpp b/Telegram/SourceFiles/chat_helpers/stickers_lottie.cpp
index ed7a11731..b7d45af42 100644
--- a/Telegram/SourceFiles/chat_helpers/stickers_lottie.cpp
+++ b/Telegram/SourceFiles/chat_helpers/stickers_lottie.cpp
@@ -15,6 +15,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "data/data_file_origin.h"
 #include "storage/cache/storage_cache_database.h"
+#include "media/clip/media_clip_reader.h"
 #include "ui/effects/path_shift_gradient.h"
 #include "main/main_session.h"
 
@@ -130,10 +131,12 @@ not_null<Lottie::Animation*> LottieAnimationFromDocument(
 }
 
 bool HasLottieThumbnail(
+		Data::StickersSetFlags flags,
 		Data::StickersSetThumbnailView *thumb,
 		Data::DocumentMedia *media) {
 	if (thumb) {
-		return !thumb->content().isEmpty();
+		return !(flags & Data::StickersSetFlag::Webm)
+			&& !thumb->content().isEmpty();
 	} else if (!media) {
 		return false;
 	}
@@ -189,6 +192,44 @@ std::unique_ptr<Lottie::SinglePlayer> LottieThumbnail(
 		box);
 }
 
+bool HasWebmThumbnail(
+		Data::StickersSetFlags flags,
+		Data::StickersSetThumbnailView *thumb,
+		Data::DocumentMedia *media) {
+	if (thumb) {
+		return (flags & Data::StickersSetFlag::Webm)
+			&& !thumb->content().isEmpty();
+	} else if (!media) {
+		return false;
+	}
+	const auto document = media->owner();
+	if (const auto info = document->sticker()) {
+		if (!info->isWebm()) {
+			return false;
+		}
+		media->automaticLoad(document->stickerSetOrigin(), nullptr);
+		if (!media->loaded()) {
+			return false;
+		}
+		return document->bigFileBaseCacheKey().valid();
+	}
+	return false;
+}
+
+Media::Clip::ReaderPointer WebmThumbnail(
+		Data::StickersSetThumbnailView *thumb,
+		Data::DocumentMedia *media,
+		Fn<void(Media::Clip::Notification)> callback) {
+	return thumb
+		? ::Media::Clip::MakeReader(
+			thumb->content(),
+			std::move(callback))
+		: ::Media::Clip::MakeReader(
+			media->owner()->location(),
+			media->bytes(),
+			std::move(callback));
+}
+
 bool PaintStickerThumbnailPath(
 		QPainter &p,
 		not_null<Data::DocumentMedia*> media,
diff --git a/Telegram/SourceFiles/chat_helpers/stickers_lottie.h b/Telegram/SourceFiles/chat_helpers/stickers_lottie.h
index 3a24b6422..20407423a 100644
--- a/Telegram/SourceFiles/chat_helpers/stickers_lottie.h
+++ b/Telegram/SourceFiles/chat_helpers/stickers_lottie.h
@@ -7,12 +7,22 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+namespace base {
+template <typename Enum>
+class Flags;
+} // namespace base
+
 namespace Storage {
 namespace Cache {
 struct Key;
 } // namespace Cache
 } // namespace Storage
 
+namespace Media::Clip {
+class ReaderPointer;
+enum class Notification;
+} // namespace Media::Clip
+
 namespace Lottie {
 class SinglePlayer;
 class MultiPlayer;
@@ -33,6 +43,8 @@ class PathShiftGradient;
 namespace Data {
 class DocumentMedia;
 class StickersSetThumbnailView;
+enum class StickersSetFlag;
+using StickersSetFlags = base::flags<StickersSetFlag>;
 } // namespace Data
 
 namespace ChatHelpers {
@@ -70,6 +82,7 @@ enum class StickerLottieSize : uchar {
 	QSize box);
 
 [[nodiscard]] bool HasLottieThumbnail(
+	Data::StickersSetFlags flags,
 	Data::StickersSetThumbnailView *thumb,
 	Data::DocumentMedia *media);
 [[nodiscard]] std::unique_ptr<Lottie::SinglePlayer> LottieThumbnail(
@@ -79,6 +92,15 @@ enum class StickerLottieSize : uchar {
 	QSize box,
 	std::shared_ptr<Lottie::FrameRenderer> renderer = nullptr);
 
+[[nodiscard]] bool HasWebmThumbnail(
+	Data::StickersSetFlags flags,
+	Data::StickersSetThumbnailView *thumb,
+	Data::DocumentMedia *media);
+[[nodiscard]] Media::Clip::ReaderPointer WebmThumbnail(
+	Data::StickersSetThumbnailView *thumb,
+	Data::DocumentMedia *media,
+	Fn<void(Media::Clip::Notification)> callback);
+
 bool PaintStickerThumbnailPath(
 	QPainter &p,
 	not_null<Data::DocumentMedia*> media,
diff --git a/Telegram/SourceFiles/data/data_document_media.h b/Telegram/SourceFiles/data/data_document_media.h
index 5a2fea7c7..799687466 100644
--- a/Telegram/SourceFiles/data/data_document_media.h
+++ b/Telegram/SourceFiles/data/data_document_media.h
@@ -14,7 +14,7 @@ class FileLoader;
 
 namespace Media {
 namespace Clip {
-enum Notification : int;
+enum class Notification;
 class ReaderPointer;
 } // namespace Clip
 } // namespace Media
diff --git a/Telegram/SourceFiles/data/stickers/data_stickers_set.cpp b/Telegram/SourceFiles/data/stickers/data_stickers_set.cpp
index 3e4895190..3fccebd02 100644
--- a/Telegram/SourceFiles/data/stickers/data_stickers_set.cpp
+++ b/Telegram/SourceFiles/data/stickers/data_stickers_set.cpp
@@ -49,7 +49,8 @@ StickersSetFlags ParseStickersSetFlags(const MTPDstickerSet &data) {
 	return (data.is_archived() ? Flag::Archived : Flag())
 		| (data.is_official() ? Flag::Official : Flag())
 		| (data.is_masks() ? Flag::Masks : Flag())
-		| (data.vinstalled_date() ? Flag::Installed : Flag());
+		| (data.vinstalled_date() ? Flag::Installed : Flag())
+		| (data.is_gifs() ? Flag::Webm : Flag());
 }
 
 StickersSet::StickersSet(
diff --git a/Telegram/SourceFiles/data/stickers/data_stickers_set.h b/Telegram/SourceFiles/data/stickers/data_stickers_set.h
index 03fc0c019..01ecbf581 100644
--- a/Telegram/SourceFiles/data/stickers/data_stickers_set.h
+++ b/Telegram/SourceFiles/data/stickers/data_stickers_set.h
@@ -54,6 +54,7 @@ enum class StickersSetFlag {
 	Featured = (1 << 5),
 	Unread = (1 << 6),
 	Special = (1 << 7),
+	Webm = (1 << 8),
 };
 inline constexpr bool is_flag_type(StickersSetFlag) { return true; };
 using StickersSetFlags = base::flags<StickersSetFlag>;
diff --git a/Telegram/SourceFiles/inline_bots/inline_bot_layout_internal.cpp b/Telegram/SourceFiles/inline_bots/inline_bot_layout_internal.cpp
index 3b6ce3231..64370851e 100644
--- a/Telegram/SourceFiles/inline_bots/inline_bot_layout_internal.cpp
+++ b/Telegram/SourceFiles/inline_bots/inline_bot_layout_internal.cpp
@@ -393,7 +393,7 @@ void Gif::unloadHeavyPart() {
 void Gif::clipCallback(Media::Clip::Notification notification) {
 	using namespace Media::Clip;
 	switch (notification) {
-	case NotificationReinit: {
+	case Notification::Reinit: {
 		if (_gif) {
 			if (_gif->state() == State::Error) {
 				_gif.setBad();
@@ -416,7 +416,7 @@ void Gif::clipCallback(Media::Clip::Notification notification) {
 		update();
 	} break;
 
-	case NotificationRepaint: {
+	case Notification::Repaint: {
 		if (_gif && !_gif->currentDisplayed()) {
 			update();
 		}
@@ -1583,7 +1583,7 @@ void Game::unloadHeavyPart() {
 void Game::clipCallback(Media::Clip::Notification notification) {
 	using namespace Media::Clip;
 	switch (notification) {
-	case NotificationReinit: {
+	case Notification::Reinit: {
 		if (_gif) {
 			if (_gif->state() == State::Error) {
 				_gif.setBad();
@@ -1610,7 +1610,7 @@ void Game::clipCallback(Media::Clip::Notification notification) {
 		update();
 	} break;
 
-	case NotificationRepaint: {
+	case Notification::Repaint: {
 		if (_gif && !_gif->currentDisplayed()) {
 			update();
 		}
diff --git a/Telegram/SourceFiles/media/clip/media_clip_reader.cpp b/Telegram/SourceFiles/media/clip/media_clip_reader.cpp
index f27f01397..e0ccdfa0f 100644
--- a/Telegram/SourceFiles/media/clip/media_clip_reader.cpp
+++ b/Telegram/SourceFiles/media/clip/media_clip_reader.cpp
@@ -133,12 +133,12 @@ void Reader::init(const Core::FileLocation &location, const QByteArray &data) {
 
 Reader::Frame *Reader::frameToShow(int32 *index) const { // 0 means not ready
 	int step = _step.loadAcquire(), i;
-	if (step == WaitingForDimensionsStep) {
+	if (step == kWaitingForDimensionsStep) {
 		if (index) *index = 0;
 		return nullptr;
-	} else if (step == WaitingForRequestStep) {
+	} else if (step == kWaitingForRequestStep) {
 		i = 0;
-	} else if (step == WaitingForFirstFrameStep) {
+	} else if (step == kWaitingForFirstFrameStep) {
 		i = 0;
 	} else {
 		i = (step / 2) % 3;
@@ -149,12 +149,12 @@ Reader::Frame *Reader::frameToShow(int32 *index) const { // 0 means not ready
 
 Reader::Frame *Reader::frameToWrite(int32 *index) const { // 0 means not ready
 	int32 step = _step.loadAcquire(), i;
-	if (step == WaitingForDimensionsStep) {
+	if (step == kWaitingForDimensionsStep) {
 		i = 0;
-	} else if (step == WaitingForRequestStep) {
+	} else if (step == kWaitingForRequestStep) {
 		if (index) *index = 0;
 		return nullptr;
-	} else if (step == WaitingForFirstFrameStep) {
+	} else if (step == kWaitingForFirstFrameStep) {
 		i = 0;
 	} else {
 		i = ((step + 2) / 2) % 3;
@@ -165,7 +165,9 @@ Reader::Frame *Reader::frameToWrite(int32 *index) const { // 0 means not ready
 
 Reader::Frame *Reader::frameToWriteNext(bool checkNotWriting, int32 *index) const {
 	int32 step = _step.loadAcquire(), i;
-	if (step == WaitingForDimensionsStep || step == WaitingForRequestStep || (checkNotWriting && (step % 2))) {
+	if (step == kWaitingForDimensionsStep
+		|| step == kWaitingForRequestStep
+		|| (checkNotWriting && (step % 2))) {
 		if (index) *index = 0;
 		return nullptr;
 	}
@@ -176,10 +178,10 @@ Reader::Frame *Reader::frameToWriteNext(bool checkNotWriting, int32 *index) cons
 
 void Reader::moveToNextShow() const {
 	int32 step = _step.loadAcquire();
-	if (step == WaitingForDimensionsStep) {
-	} else if (step == WaitingForRequestStep) {
-		_step.storeRelease(WaitingForFirstFrameStep);
-	} else if (step == WaitingForFirstFrameStep) {
+	if (step == kWaitingForDimensionsStep) {
+	} else if (step == kWaitingForRequestStep) {
+		_step.storeRelease(kWaitingForFirstFrameStep);
+	} else if (step == kWaitingForFirstFrameStep) {
 	} else if (!(step % 2)) {
 		_step.storeRelease(step + 1);
 	}
@@ -187,10 +189,10 @@ void Reader::moveToNextShow() const {
 
 void Reader::moveToNextWrite() const {
 	int32 step = _step.loadAcquire();
-	if (step == WaitingForDimensionsStep) {
-		_step.storeRelease(WaitingForRequestStep);
-	} else if (step == WaitingForRequestStep) {
-	} else if (step == WaitingForFirstFrameStep) {
+	if (step == kWaitingForDimensionsStep) {
+		_step.storeRelease(kWaitingForRequestStep);
+	} else if (step == kWaitingForRequestStep) {
+	} else if (step == kWaitingForFirstFrameStep) {
 		_step.storeRelease(0);
 
 		// Force paint the first frame so moveToNextShow() is called.
@@ -200,7 +202,10 @@ void Reader::moveToNextWrite() const {
 	}
 }
 
-void Reader::callback(Reader *reader, qint32 threadIndex, qint32 notification) {
+void Reader::SafeCallback(
+		Reader *reader,
+		int threadIndex,
+		Notification notification) {
 	// Check if reader is not deleted already
 	if (managers.size() > threadIndex && managers.at(threadIndex)->carries(reader) && reader->_callback) {
 		reader->_callback(Notification(notification));
@@ -211,7 +216,7 @@ void Reader::start(int32 framew, int32 frameh, int32 outerw, int32 outerh, Image
 	if (managers.size() <= _threadIndex) error();
 	if (_state == State::Error) return;
 
-	if (_step.loadAcquire() == WaitingForRequestStep) {
+	if (_step.loadAcquire() == kWaitingForRequestStep) {
 		int factor = style::DevicePixelRatio();
 		FrameRequest request;
 		request.factor = factor;
@@ -613,23 +618,29 @@ bool Manager::carries(Reader *reader) const {
 	return _readerPointers.contains(reader);
 }
 
-Manager::ReaderPointers::iterator Manager::unsafeFindReaderPointer(ReaderPrivate *reader) {
-	ReaderPointers::iterator it = _readerPointers.find(reader->_interface);
+auto Manager::unsafeFindReaderPointer(ReaderPrivate *reader)
+-> ReaderPointers::iterator {
+	const auto it = _readerPointers.find(reader->_interface);
 
 	// could be a new reader which was realloced in the same address
-	return (it == _readerPointers.cend() || it.key()->_private == reader) ? it : _readerPointers.end();
+	return (it == _readerPointers.cend() || it.key()->_private == reader)
+		? it
+		: _readerPointers.end();
 }
 
-Manager::ReaderPointers::const_iterator Manager::constUnsafeFindReaderPointer(ReaderPrivate *reader) const {
-	ReaderPointers::const_iterator it = _readerPointers.constFind(reader->_interface);
+auto Manager::constUnsafeFindReaderPointer(ReaderPrivate *reader) const
+-> ReaderPointers::const_iterator {
+	const auto it = _readerPointers.constFind(reader->_interface);
 
 	// could be a new reader which was realloced in the same address
-	return (it == _readerPointers.cend() || it.key()->_private == reader) ? it : _readerPointers.cend();
+	return (it == _readerPointers.cend() || it.key()->_private == reader)
+		? it
+		: _readerPointers.cend();
 }
 
 void Manager::callback(Reader *reader, Notification notification) {
 	crl::on_main([=, threadIndex = reader->threadIndex()] {
-		Reader::callback(reader, threadIndex, notification);
+		Reader::SafeCallback(reader, threadIndex, notification);
 	});
 }
 
@@ -639,14 +650,14 @@ bool Manager::handleProcessResult(ReaderPrivate *reader, ProcessResult result, c
 	if (result == ProcessResult::Error) {
 		if (it != _readerPointers.cend()) {
 			it.key()->error();
-			callback(it.key(), NotificationReinit);
+			callback(it.key(), Notification::Reinit);
 			_readerPointers.erase(it);
 		}
 		return false;
 	} else if (result == ProcessResult::Finished) {
 		if (it != _readerPointers.cend()) {
 			it.key()->finished();
-			callback(it.key(), NotificationReinit);
+			callback(it.key(), Notification::Reinit);
 		}
 		return false;
 	}
@@ -682,14 +693,14 @@ bool Manager::handleProcessResult(ReaderPrivate *reader, ProcessResult result, c
 		if (result == ProcessResult::Started) {
 			reader->startedAt(ms);
 			it.key()->moveToNextWrite();
-			callback(it.key(), NotificationReinit);
+			callback(it.key(), Notification::Reinit);
 		}
 	} else if (result == ProcessResult::Paused) {
 		it.key()->moveToNextWrite();
-		callback(it.key(), NotificationReinit);
+		callback(it.key(), Notification::Reinit);
 	} else if (result == ProcessResult::Repaint) {
 		it.key()->moveToNextWrite();
-		callback(it.key(), NotificationRepaint);
+		callback(it.key(), Notification::Repaint);
 	}
 	return true;
 }
diff --git a/Telegram/SourceFiles/media/clip/media_clip_reader.h b/Telegram/SourceFiles/media/clip/media_clip_reader.h
index b4ea5a3e9..430acb28d 100644
--- a/Telegram/SourceFiles/media/clip/media_clip_reader.h
+++ b/Telegram/SourceFiles/media/clip/media_clip_reader.h
@@ -39,15 +39,19 @@ struct FrameRequest {
 	RectParts corners = RectPart::AllCorners;
 };
 
-enum ReaderSteps : int {
-	WaitingForDimensionsStep = -3, // before ReaderPrivate read the first image and got the original frame size
-	WaitingForRequestStep = -2, // before Reader got the original frame size and prepared the frame request
-	WaitingForFirstFrameStep = -1, // before ReaderPrivate got the frame request and started waiting for the 1-2 delay
-};
+// Before ReaderPrivate read the first image and got the original frame size.
+inline constexpr auto kWaitingForDimensionsStep = -3;
 
-enum Notification : int {
-	NotificationReinit,
-	NotificationRepaint,
+// Before Reader got the original frame size and prepared the frame request.
+inline constexpr auto kWaitingForRequestStep = -2;
+
+// Before ReaderPrivate got the frame request
+// and started waiting for the 1-2 delay.
+inline constexpr auto kWaitingForFirstFrameStep = -1;
+
+enum class Notification {
+	Reinit,
+	Repaint,
 };
 
 class ReaderPrivate;
@@ -64,7 +68,10 @@ public:
 	Reader(const QByteArray &data, Callback &&callback);
 
 	// Reader can be already deleted.
-	static void callback(Reader *reader, qint32 threadIndex, qint32 notification);
+	static void SafeCallback(
+		Reader *reader,
+		int threadIndex,
+		Notification notification);
 
 	void start(int framew, int frameh, int outerw, int outerh, ImageRoundRadius radius, RectParts corners);
 	QPixmap current(int framew, int frameh, int outerw, int outerh, ImageRoundRadius radius, RectParts corners, crl::time ms);
@@ -94,7 +101,7 @@ public:
 	State state() const;
 	bool started() const {
 		auto step = _step.loadAcquire();
-		return (step == WaitingForFirstFrameStep) || (step >= 0);
+		return (step == kWaitingForFirstFrameStep) || (step >= 0);
 	}
 	bool ready() const;
 
@@ -120,7 +127,7 @@ private:
 	mutable int _height = 0;
 
 	// -2, -1 - init, 0-5 - work, show ((state + 1) / 2) % 3 state, write ((state + 3) / 2) % 3
-	mutable QAtomicInt _step = WaitingForDimensionsStep;
+	mutable QAtomicInt _step = kWaitingForDimensionsStep;
 	struct Frame {
 		void clear() {
 			pix = QPixmap();
diff --git a/Telegram/SourceFiles/overview/overview_layout.cpp b/Telegram/SourceFiles/overview/overview_layout.cpp
index f87611eff..c88648948 100644
--- a/Telegram/SourceFiles/overview/overview_layout.cpp
+++ b/Telegram/SourceFiles/overview/overview_layout.cpp
@@ -1897,7 +1897,7 @@ QSize Gif::countFrameSize() const {
 void Gif::clipCallback(Media::Clip::Notification notification) {
 	using namespace Media::Clip;
 	switch (notification) {
-	case NotificationReinit: {
+	case Notification::Reinit: {
 		if (_gif) {
 			if (_gif->state() == State::Error) {
 				_gif.setBad();
@@ -1926,7 +1926,7 @@ void Gif::clipCallback(Media::Clip::Notification notification) {
 		update();
 	} break;
 
-	case NotificationRepaint: {
+	case Notification::Repaint: {
 		if (_gif && !_gif->currentDisplayed()) {
 			update();
 		}
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
index 9faf52242..e1d1a51f1 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
@@ -133,7 +133,7 @@ void SingleMediaPreview::clipCallback(
 		Media::Clip::Notification notification) {
 	using namespace Media::Clip;
 	switch (notification) {
-	case NotificationReinit: {
+	case Notification::Reinit: {
 		if (_gifPreview && _gifPreview->state() == State::Error) {
 			_gifPreview.setBad();
 		}
@@ -152,7 +152,7 @@ void SingleMediaPreview::clipCallback(
 		update();
 	} break;
 
-	case NotificationRepaint: {
+	case Notification::Repaint: {
 		if (_gifPreview && !_gifPreview->currentDisplayed()) {
 			update();
 		}
diff --git a/Telegram/SourceFiles/window/window_media_preview.cpp b/Telegram/SourceFiles/window/window_media_preview.cpp
index 4ee042b5d..dcdfd9571 100644
--- a/Telegram/SourceFiles/window/window_media_preview.cpp
+++ b/Telegram/SourceFiles/window/window_media_preview.cpp
@@ -391,7 +391,7 @@ void MediaPreviewWidget::clipCallback(
 		Media::Clip::Notification notification) {
 	using namespace Media::Clip;
 	switch (notification) {
-	case NotificationReinit: {
+	case Notification::Reinit: {
 		if (_gifThumbnail && _gifThumbnail->state() == State::Error) {
 			_gifThumbnail.setBad();
 		}
@@ -413,7 +413,7 @@ void MediaPreviewWidget::clipCallback(
 		update();
 	} break;
 
-	case NotificationRepaint: {
+	case Notification::Repaint: {
 		if ((_gif && _gif->started() && !_gif->currentDisplayed())
 			|| (_gifThumbnail
 				&& _gifThumbnail->started()