Starters: Phone is entirely stock, 64 GB San Disk SD Card
So starting yesterday, whenever I copy a new file (mostly mp3's) to my SD card and go to play it off my phone, they are not working. When I go back onto my computer and look up the file it's gone! I've never seen anything like this before. All the files on my SD card that were there before yesterday are still working normally. The mp3s on my internal storage are also working properly.
A separate but potentially related issue is that recently, when I take pictures they show up in my gallery at first, but then they come up as corrupted a few minutes later and then they are gone completely. They are saved to my internal storage. This is not happening 100% of the time.
I'm not sure what's going on with my phones storage. Any help would be greatly appreciated. Thank you !