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. To edit your name or bio, click the Menu icon and select “Manage Channel.” Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” How to create a business channel on Telegram? (Tutorial) Add up to 50 administrators
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