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. To delete a channel with over 1,000 subscribers, you need to contact user support Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” Concise 4How to customize a Telegram channel?
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