LG G4 :: Can't Preview Ringtones

I distinctly remember setting a separate ring-tone for one of my favorites. But then, out of the blue, her ring tone switched to the default. I was just trying to edit the contact. But when I select a new ring tone, it no longer previews. I can select one, but not have it play right away.

I tried powering the phone off and back on, but still cannot preview the ring tones. I played around with the "compose ringtones" option that makes a ring tone out of the phone number, but that doesn't work because it does it for each phone number for each favorite. So that I would have to memorize more than 10 similar ring tones. But at least I could press the play button and preview the tones. That tells me it is not the default sound playing app that is the issue.