What version of firefly are you using?
As far as I know that playlist file has been deprecated a while ago.
Firefly now is able to process iTunes.xml as well as m3u, pls, and other more common playlist formats directly.
I’m a little confused as to how this works. I tried copying a file called “iTunes Music Library.xml” from my mac to the music folder on the server running mt-daapd. However, the playlists that were created within iTunes on the mac, presumably contained in that file, do not show up when I connect to the server within iTunes (all of the music is there, however).
Is this the iTunes.xml file to which you are referring? What am I missing?