Telegram Android app: Open the chats list, click the menu icon and select “New Channel.” To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. How to build a private or public channel on Telegram? Step-by-step tutorial on desktop: 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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