The app is looking for the GarageDoorControl capability to use the garage door device type by default (or let you change to it). I get that from the MyQ garage door Hubitat driver I'm using.
I might be able to handle the zen-16 driver you're using if there's something I can look for in the device details. If you're able to send me a device log or even just the JSON text that the app would see from MakerAPI details on this device I can try to support it out of the box. I put together a page on how to get device details info if you want to do that too
