Hi there @xcountytravelers...I struggled with such issues and have some experience. Propane heaters are really simple mechanisms. Maybe it’s a failure at the flame valve it’s just this I will show you in the picture:

Image source Amazon
If the switch on thing works ok (you have sparks) then may be that gas valve.
If it’s damaged it won’t last open when the little flame has to heat it so no gas will flow once the start(switch on) button (or whatever it uses) will be released. Even the ignition flame will be off.
It’s a cheap part (here in Spain) and very easy to change. You take it off and bring it to a gas or plumbering supplies store so they provide you the proper spare part. Mount it in place and start heating yourself!
Be aware you need to check for gas leaks on the threads after mounting it.
Here how-to detect gas leaks video :

Hope this will help you on this issue.
Big hugs over there ❤️