How to create a business channel on Telegram? (Tutorial) A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Add up to 50 administrators To edit your name or bio, click the Menu icon and select “Manage Channel.” 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.
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