If your "Avatar" request refers to a personal profile picture, Telegram supports high-definition uploads: Tap your profile and select the camera icon. Toggle the quality setting from

If you find a legitimate video file (such as a high-res trailer or authorized clip) shared within a chat, you can save it to your device: Open the Video : Tap on the video file in the chat. Access Menu : Tap the three dots (menu) in the top-right corner. Save to Gallery "Save to Gallery" "Save to Downloads" to store the 4K file locally. Setting a 4K Profile Picture (Avatar)

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