‘Ban’ on Telegram Done! Now you’re the proud owner of a Telegram channel. The next step is to set up and customize your channel. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Click “Save” ; 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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