For most public or open groups, downloading an MP4 file is straightforward:
Always ensure you have the right to download and distribute the content, especially if it belongs to a private educational or professional community.
Use a browser-based version of Telegram (like web.telegram.org ) alongside media downloader scripts (e.g., via Tampermonkey) to bypass UI restrictions.
As a last resort, using built-in screen recording tools on your phone or PC allows you to capture the video while it plays.