: A glitch in how the Multimedia Messaging Service (MMS) processes the file during transit.
Are you this file from someone else, or did it appear after you sent a photo?
Users on platforms like the Apple Support Community and Reddit have reported similar issues where photos sent from Android (often via Google Messages ) arrive on iPhones as unplayable .mp4 files. This typically happens due to:
: For Android users, go to Settings > Apps > Messages > Storage and tap Clear cache .
Pixel 6: Messages coming to me looking like photos I can't download