Projects appear to only be able to be on the iPad or in the cloud. With iOS 13, usb hard drives can be connected to iPads. Is there a way to store projects to a connected external drive instead of the other two options?
Yes there is if you open the files app and click on my iPad then you will see the cinamaker click on cinamaker and you will see the project files then you can save it to a external drive
Here is a video showing how to do it
Here is a example