How to build a private or public channel on Telegram? Informative Don’t publish new content at nighttime. Since not all users disable notifications for the night, you risk inadvertently disturbing them. Telegram Android app: Open the chats list, click the menu icon and select “New 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.
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