Build a FM iOS app in Xcode with Plugin.
Now archive in Xcode which builds a copy for device.
In the window with archived versions use Validate or send to store.
You get an error like this:
iTunes Store operation failed.
Invalid Swift Support. The file iOS SDK Test.app/Frameworks/MBS.fmplugin doesn’t have the correct file type for this location. Ensure you’re using the correct file, rebuild your app using the current public (GM) version of Xcode, and resubmit it.