A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Informative 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. A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” How to Create a Private or Public Channel on Telegram?
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