To delete a channel with over 1,000 subscribers, you need to contact user support 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. Telegram Channels requirements & features Don’t publish new content at nighttime. Since not all users disable notifications for the night, you risk inadvertently disturbing them. Step-by-step tutorial on desktop:
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