Could you clarify if you are trying to this video into a specific format, or if you are having trouble opening it on your device? AI responses may include mistakes. Learn more MP4 files explained: How to open and use - Adobe
You can upload the MP4 to the Adobe Express Video Editor to trim the clip, add text overlays, and apply filters.
For a Mac, QuickTime supports MP4 and on Windows, you can use Windows Media Player. How to play MP4 files in Windows - Microsoft Support
Use QuickTime Player , which natively supports MP4 files.
If you are trying to turn this clip into a short-form "feature" (like a TikTok, Reel, or YouTube Short), you can use free tools to add music, captions, and effects: