While recently on travel I was unexpectedly caught in a rain storm, my S21 Ultra got a bit damp, not wet, just damp. Several days later after arriving back home I discovered that all videos (MP4) taken after the rain exposure will correctly play on my S21 Ultra (both audio and video) but when I download them to my computer it does not recognize the file as an mp4 video (like the video is corrupted). All the video's recorded prior to the rain exposure play on my S21 and the computer without issue. Tried emailing the mp4 vid. to my computer and direct connecting my S21 to the computer via a USB cable, not change. Tried updating the software on the S21 (ver. G998UOYN5DVK3/G998USQU5DVK3), did not resolve the issue.
Do you have "show file extensions" enabled on your pc so you can confirm the files still show as being mp4s? What happens if you change the extension to mkv and try to play them then on the pc?
The file extension is shown on all files on my computer, and yes the ext. is "mp4". I changed one of the problem files that the vid. does not show (audio only) to mkv ext. and tried to play. No change. Then I changed back to mp4, no change. Also, as I mentioned, all previous vids from my S21 (pre-rain storm) are fine. These vids recorded pre-rainstorm are fine, they play on the cell phone and my computer.
