I don't seem to be able to figure out how to make my iOS notifications trigger the default iOS notification sound. When I create a message in the UA message creator, on the 'delivery' tab, I see an option for 'Sound'. When I turn this on a text entry appears. It seems like I am supposed to enter a sound file that is contained within my app. Is there any way to just get it to play the default system sound? Using 'default' does not appear to work.
Additionally, in the API reference (https://docs.airship.com/api/ua/) it mentioned a sound parameter, but again this seems to be referencing a sound file within ones app and no way to set 'default'.
I believe if I could get the APNS package coming to the app to have a segment like the accepted answer in this SO post, it would work: https://stackoverflow.com/questions/26973415/ios-push-notification-no-sound
Could you offer me any advice?