To note, using a connector as a default file storage is no longer the recommended approach as the APIs that the 3rd party provides is not suitable for application type storages. They often have limits and restrictions that do not suite application usage and are more suited for consumer / end user type scenarios.
Nintex now provides a default file storage as part of the tenant that will handle files.
Really, how do I use the default storage? Any direction to the help documentation would be great.