To delete a channel with over 1,000 subscribers, you need to contact user support Invite up to 200 users from your contacts to join your channel 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. It’s easy to create a Telegram channel via desktop app or mobile app (for Android and iOS): Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.”
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