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 Channel login must contain 5-32 characters 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. best-secure-messaging-apps-shutterstock-1892950018.jpg
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