The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar. Administrators A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” How to build a private or public channel on Telegram?
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