IPhone : iOS8.2 not playing custom alert sound from parse.com app

I have successfully set up a push notification app via Parse.com. App is installed on iPhone 5s running iOS8.2. App code in Swift

If I send a regular push notification, it comes up fine, but plays the very short buzz (like 'quick' vibration or very short standard 'note' text alert, rather than what I have set as the standard text alert.

(If I send an iMessage, and have the alert tone set to 'chord', it plays that OK)

If I instead send the dictionary version with a custom sound included in the app bundle (yes, I converted it in terminal per Apple instructions), it still does the same as above. I cannot get it to play any custom alert sounds.

It makes no difference if I originate the push from the app, or from the button on Parse.com