A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Add up to 50 administrators 4How to customize a Telegram channel? Choose quality over quantity. Remember that one high-quality post is better than five short publications of questionable value. 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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