iPhone SE 2020
My Question or Issue
I have a playlist that includes songs not available on Spotify, so I sync the local files from my desktop to my phone. This worked fine until a few days ago my local files on my phone became unplayable (greyed out). The song is downloaded to the phone (the green arrow shows, see the song called "5334" in the attached screenshot for an example), but I cannot press on it, and opening the menu on it does not show the play option. How can I play my local files again?