2How to set up a Telegram channel? (A step-by-step tutorial) Invite up to 200 users from your contacts to join your channel Users are more open to new information on workdays rather than weekends. The visual aspect of channels is very critical. In fact, design is the first thing that a potential subscriber pays attention to, even though unconsciously. 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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