Zoom Controls on Map with Markers

I’m following the tutorial that was created here

I’m running into trouble getting the zoom to work though. I have very large floor plans that I’d like to start off in a ‘Zoom All’ type of setting, allowing the user to use their scroll wheel to zoom in closer on specific areas of the floor plan.

Switching the zoomable parameter from the tutorial to True seems to work for the markers, but the background itself isn’t zooming.

Any ideas on how I can get this to work?