Have a Private playlist. One track in particular I have replaced the file and played successfully on multiple laptops. When I play on my ios device (iphone 6, v10.1.1) it will not play the latest version, plays previous version. Have re-replaced file multiple times and confirmed works through multiple laptops and browsers. iOS mobile app will not pull the new version.
Recently replaced a song on another song of the same private playlist, worked fine. Not sure the issue, and saw multiple posts on this subject that went nowhere. My guess is the track in your platform is somehow jeopardized and I need to delete the track and re-create.