Can't drag new songs to Music

If I click on an MP3 file or drag it to Music, I can't listen to that song.

When I double click to open, music indeed opens but it does not open the file.

If I drag the file to the tab songs, the green plus sign appears but when drop the file on it nothing happens.

If I choose to open the file with VLC it opens and plays normally.

What can I do to add new songs to Music?

Thanks