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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 Channel name and bio must be no more than 255 characters long To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. To delete a channel with over 1,000 subscribers, you need to contact user support 5Telegram Channel avatar size/dimensions
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