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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. Clear 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. Telegram desktop app: In the upper left corner, click the Menu icon (the one with three lines). Select “New Channel” from the drop-down menu.
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