Why are songs I own and added to Spotify being deleted from playlists?

[IsabellaLeigh]

Plan

Premium

Country

United States

Device

Samsung Galaxy Android Phone

My Question or Issue

I have an album that I bought on Amazon and downloaded to both my laptop and my phone. I then added the songs to some of my playlists. A few days ago, one of those songs grayed out. As of today, there are three. I can force them to play my clicking on them, so the problem is not that they are unavailable (which would still not make sense, since I own them, and they are files on my device, not actually Spotify content). They just won't play as part of a playlist- any playlist. How do I fix that? Because if that is not fixed, I'm going to have to switch to a different service. I bought that album specifically to be able to add songs fromitto my Spotify playlists - which I am slowly losing the ability to do.