I originally imported my whole Rekordbox XML (around 6000 tracks), only 944 tracks would show up on the mobile app, so I remove everything & have started again.

Instead I'm trying to do imports by Music (new iTunes) playlists (one by one) via M3U - this will also allow me to have the tracks split into playlists to view on the mobile app too (instead of using XML).

When adding an M3U (I tried M3U8 too) the playlist imports but no tracks import. I have checked the file locations within the M3U and they are correct. Any ideas why tracks are not importing? (Example attached - UPDATE: can't attach an M3U file to the topic? I can paste in if needed.)