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Activate up to 20 bots 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. 2How to set up a Telegram channel? (A step-by-step tutorial) Step-by-step tutorial on desktop: To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon.
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