I have my iTunes library on my external hdd and added a track to an playlist.
Everything goes and works fine in iTunes, I can play the whole song from begin to end (also in other applications on MAC/Windows), but it get's stuck and prompts me the error that the file is not readable when I want to sync the song with my iPhone.
I tried to copy & paste the file from the hdd to my laptop's hdd and this works fine. Why can't iTunes copy the file to my iPhone?