Telegram desktop app: In the upper left corner, click the Menu icon (the one with three lines). Select “New Channel” from the drop-down menu. 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. Each account can create up to 10 public channels Done! Now you’re the proud owner of a Telegram channel. The next step is to set up and customize your channel. Unlimited number of subscribers per channel
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