I have setup a NAS (Synology) and copied my iTunes music folder to the NAS. In iTunes on each computer I changed the location to the shared folder on the NAS. This part is working and all the computers see the music. The problem I am having is when one computer buys a song it gets downloaded to the shared folder and it shows in that computers iTunes. When one of the other computers open iTunes they don't automatically see that new song. How do I fix that ?