4How to customize a Telegram channel? Image: Telegram. You can invite up to 200 people from your contacts to join your channel as the next step. Select the users you want to add and click “Invite.” You can skip this step altogether. 5Telegram Channel avatar size/dimensions 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.
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