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