Sharing by the hub itself is not planned.
The principle of Direct Connect is that the hub connects all the users, and the users can then make direct connections to each other for file sharing. The hub doesn't share any files itself, the users share the files.
So you can take your NAS with FlexHub on it to a LAN party, and all the users on the LAN can then use their DC client to connect to the FlexHub on your NAS and share files with each other.
But.. ofcourse you can use your own DC client to share files that are located somewhere on the NAS. As soon as you connect to the hub those files can be shared with the other users connected to the hub then.