So this stems from my earlier Google Maps issue - the bottom line is that, for some reason, when I add XYZ maps to a Fusion application, they don't show up in my list of external providers. I don't have a clue where to start to troubleshoot that problem.
Here's the Fusion app:
Here's the resulting drop down:
One tidbit of info that might point to the problem is that if I move the XYZ map to the top of the list in the app definition,
I get this fusion error:
Can anyone point me in the right direction to solve this? It doesn't seem to matter what I put in the URL field for the XYZ map.