I've exchanged the Movies folder in my iTunes folder for an alias that points to an external drive with all my videos. If I play a video in iTunes, it works fine (so the alias appears to work), but now, if I try to import a new video into iTunes I get the error "Attempting to copy to the disk "Macintosh HD" failed. The required folder cannot be found." But I don't see what my Mac's HD has to do with anything! What's the problem? Any help appreciated.