I can´t play musics from my local files (pc) on my phone!!! pls help me!!!

[blazejoao1]

I do the steps on the spotify support but i cant play the music.

1: I made a download of a music on my pc.

2: I put this music on a playlist in my spotify on my pc.

3: I go to my phone and put to download this playlist.

But the musics from my pc are black (look the screenshot) and i can´t play... so i need help for this "bug" (i dont now if this is a bug)