Night Clock mp3 alarms

[CharlesLewis]

I have been using Night Clock for a couple of years. When I first started with it, I could use mp3 files for my alarms, but I no longer have that option. My previous mp3 alarms work fine, but if I try to create a new alarm, I get only a few standard options. Another alarm app works fine, so I am assuming there's a setting I have missed.

Any suggestions?