To create a new sticker, simply click on the button with the sticker image in the login line of any chat and go to the editor by selecting the (+) button in the opened panel.
You can send the finished sticker right away or create a sticker set so your friends can use your creations in their chats. To add stickers to a set, choose an emoji that suits the mood.
Telegram itself will suggest some emojis (for example, a cat, a dog or a car) based on the analysis of the photo using artificial intelligence.
Messenger representatives have already stated on the official blog that 16 more new features are waiting for us in April.
Source: Ferra

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