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To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. 4How to customize a Telegram channel? A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. 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. Channel login must contain 5-32 characters
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