Sometimes a long or complex filename causes errors in specific apps. Try renaming it to something simple like video.mp4 .
Apps often rename files when saving them to your device. 2. Handle Corrupt or Unplayable Files xxmy7rgj93m6.mp4
If it's a "Hybrid" MP4 from OBS, ensure you let the software finish "remuxing" before moving the file, as users on Reddit suggest this is necessary for compatibility with editing software like Final Cut Pro. Sometimes a long or complex filename causes errors
Files with random alphanumeric names are typically created by: Standard MP4s store metadata at the end
Use tools like Cloudinary or HandBrake to reduce the file size without significant quality loss.
Standard MP4s store metadata at the end. If interrupted, the file is unreadable. Cloudinary notes that "Fragmented MP4s" are safer because they save data in small chunks.