Can’t add song from Google Play as my ringtone.

I bought a song on Google Play and I want to make it my ringtone. I already have File Manager installed. I can’t figure out how to download the song to my phone or laptop. The song plays on my phone but only through Google Play. It does not show up in the music file of File Manager. Can someone help?

What is your device try to use another File manager maybe you cannot see that song at default file manager ?