Can't add music to itunes library
When I try to add music to itunes, sometimes it says it links and plays the animation and then nothing is there, the file doesn't get added to the library. They are in an mp3 format that works with every other player ever, and the files that won't add seem to be random. I've already tried the thing with copying them to the automatically add to itunes folder, but they don't automatically add or move to a not added folder. They come from a variety of sources, some of them audio from videos, some of them sent over from other devices, and some of them my own music I created. How do I add music to my library?
Windows, Windows 6