How to create a business channel on Telegram? (Tutorial) 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. The channel also called on people to turn out for illegal assemblies and listed the things that participants should bring along with them, showing prior planning was in the works for riots. The messages also incited people to hurl toxic gas bombs at police and MTR stations, he added. 2How to set up a Telegram channel? (A step-by-step tutorial) To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon.
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