Files does not come up when searched

as titled. I have a song I'm playing on MM desktop right now; it shows up when I go to folder > look for it in that folder. Let's say the song is "Enya - Wild Child". I could search any of the words; "Enya" "wild" "Child", and it will say "No result found". What's up with that? I'm using free version, considering buying Gold, but encountered this problem so I haven't committed yet.