1) how do I add more zones beyond the 8? every door/window is wired independently so I have a lot

2) how can I use SmartThings app to remotely arm/disarm? Currently I can change it in the app, but it results in nothing for the actual alarm system. For example choosing "Armed (away)" button in the app doesn't actually arm the system though the app thinks arming took place.
3) there is no documentation for what's needed in "AlarmDecoder Address Mask" or "Webapp Address Mask". Both default to "ffffffff". Is that fine?
Thanks!