Anytime I add a local file song to a playlist on any platform, it causes that playlist to de-sync and two versions of that playlist begin to exist. One version with the local file song, that is on the platform where I made the change and and another version on all other platforms that lacks the local files song. Any changes made to either versions of the playlist ends up not translating to other platforms. The only way to re-sync up playlists is to clear the cache on the platform where the initial change was made. This reverts the playlist back to a state before the local files song was added. This means that it is impossible for me to transfer local files songs from my desktop to my iOS device as any time I attempt to add a local files song to a playlist on my desktop, the playlists de-sync and thus the song does not show up in the playlist on my phone. I have tried reinstalling app on both my pc and phone but neither fixes the issue.