Audiobooks on PR4100 not showing in iTunes

I moved my iTunes library to my PR4100 (Public/Music/iTunes) and turned on iTunes in the MyCloudPR4100 dashboard. My music and playlists appear to show up but my Audiobooks do not (it says MyCloudPR4100 has no audiobooks). I am running iTunes on my MacBook Pro (15-inch, Mid 2010) running High Sierra (10.13.6 (17G4015)). Any suggestions on what I need to do to get access to my audiobooks from the PR4100?

Are you able to access your AudioBooks from Mac Finder?

asp73, yes I can see the audiobook files on my PR4100, they are right with all my music files. Any thoughts?

Thank you.