Search music for ringtone

[SamStone]

I'm just setting up my MI 5S Plus and I'm used to using a custom ringtone that I always put in my music file. When I go to set the ringtone, I click the + at the bottom and what looks like some of my music MP3s come up but the one I want as a ringtone isn't listed. It's listed in the music app where I can search for it but I can'[t set it as my ringtone from there. When I try and add it from settings there is no search function that I can see and it isn't listed in my music. In the file explorer app I can search for it and find it easy but I don't see any way to set it as my ringtone. Suggestions?

 

[SamStone]

Well I answered my own question. I couldn't set the MP3 as my ringtone from the music or file app that comes with the phone so I installed ES File Explorer, found the file, opened it with the ES Media Player that is part of the app, and there was the option to set as ringtone. So if anyone else has this problem this was the way I finally was able to do it.