How to Create a Private or Public Channel on Telegram? 4How to customize a Telegram channel? Don’t publish new content at nighttime. Since not all users disable notifications for the night, you risk inadvertently disturbing them. The Channel name and bio must be no more than 255 characters long 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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