Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” 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. How to build a private or public channel on Telegram? The Channel name and bio must be no more than 255 characters long How to create a business channel on Telegram? (Tutorial)
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