Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Some Telegram Channels content management tips Members can post their voice notes of themselves screaming. Interestingly, the group doesn’t allow to post anything else which might lead to an instant ban. As of now, there are more than 330 members in the group. 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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