A new window will come up. Enter your channel name and bio. (See the character limits above.) Click โCreate.โ 4How to customize a Telegram channel? The optimal dimension of the avatar on Telegram is 512px by 512px, and itโs recommended to use PNG format to deliver an unpixelated avatar. A vandalised bank during the 2019 protest. File photo: May James/HKFP. The visual aspect of channels is very critical. In fact, design is the first thing that a potential subscriber pays attention to, even though unconsciously.
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