Purchased on iphone playlist not updating
Try to drag and drop the tones files over (.m4r format) when there is no other syncing activity going on.
Users report that they are often unable to copy a ringtone to an i Phone or i Pad when their device is syncing with i Tunes.
If you checked “Read Only”, you cannot transfer or edit the file but only read it. If you still cannot use i Tunes to sync i Phone i Pad, you can look for help from some i Tunes alternatives, such as Any Trans, to share songs, movies and pictures across all of your Apple devices.So wait for the sync to complete before dragging and dropping any additional files.