If you are using external devices or folders (other than "Music") to synchronise music to your phone, you have to enable access on a Mac software. To do this, go to File > Allow Access to Folder.
- How can I transfer music to my Lumia phone?
- Windows Phone app for Mac will not sync music on my Lumia phone. What should I do?
- What type of data can I transfer from my old phone to my new Lumia Windows Phone 8?
- How can I transfer my contacts, messages, calendar entries or photos to my Lumia?
- How can I get my lock screen background photo visible on the glance screen of my Lumia?