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Telegram News
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. Choose quality over quantity. Remember that one high-quality post is better than five short publications of questionable value. To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. Telegram Channels requirements & features
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