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To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. How to Create a Private or Public Channel on Telegram? The Channel name and bio must be no more than 255 characters long 4How to customize a Telegram 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.
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