Some Telegram Channels content management tips The optimal dimension of the avatar on Telegram is 512px by 512px, and itโs recommended to use PNG format to deliver an unpixelated avatar. Telegram iOS app: In the โChatsโ tab, click the new message icon in the right upper corner. Select โNew Channel.โ ZDNET RECOMMENDS A vandalised bank during the 2019 protest. File photo: May James/HKFP.
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