Telegram desktop app: In the upper left corner, click the Menu icon (the one with three lines). Select “New Channel” from the drop-down menu. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Some Telegram Channels content management tips 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
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