Can't use ringtones with Alarm Manager

I'm still working on my Alarm Manager app, and it seems to be functioning well overall. However, when I set it to use the device ringtone, it only works while the app is running. Are ringtones not supported by AlarmManager when the app is in the background?

You can test it yourself:
com.damiano.alarm.aix (14.8 KB)
My test aia:
aaad_1_1_1 (2).aia (148.7 KB)

I would suggest you to search your queries/issues on Google and StackOverflow first.

I already did and I will continue.