iTunes not recognising Apple files
iTunes TV seasons - when I have moved the files from a program to a backup drive, or when they have been backed up using Time Machine [and then deleted them from the iMac iTunes Media file]-- If I decide I want to play them again and move the files back into the iTunes Media file on the iMac -- very often there is a problem playing them because they are no longer recognised as iTunes files. Getting them to work is a strange and difficult process that takes quite a bit of time. I assume some little tag on them gets removed when they are backed up that causes them not to be recognised. If there is something I can do to prevent this problem I'd like to know what it is.