To delete a channel with over 1,000 subscribers, you need to contact user support A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” To view your bio, click the Menu icon and select “View channel info.” 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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