It was sent by a you were expecting a video from. You have scanned it with VirusTotal if you found it online. Upload YouTube videos - Android - Google Help

Default filenames like VID-222vvuh(1).mp4 are common in phishing or malware. Only open this file if: recorded it yourself.

If you see an error like "Format not supported" or "File corrupted":

If you hear sound but see no picture, your computer might be missing a codec. Installing the K-Lite Codec Pack usually solves this for Windows users. 3. How to Share or Upload

If the video was interrupted while recording, you can try a tool like the Restore.Media service or FixVideo to repair the header.

You can often drag and drop the .mp4 file directly into a Chrome or Safari tab to play it instantly.

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