Google Maps Overlays and App Permissions?

Hi, I’m new to app developing and am in a bit of a pickle, I’m making a GPS oriented app but i want my apps map to display information through overlays on the map (where users can interact with them by pressing a button), but I don’t know how (or if) Bubble can help me put up an overlay, anyone here know how?

Also I want the app to make little sounds when buttons are pressed, how do I give the app the ability to access sounds to use?

did you make any progress on this?

No, I’m afraid not, I just can’t figure out how to get the KML files and google maps to interface.