Can you please elaborate on what you're looking for here? Thanks.
The usb is not currently visible under the web file application... so file management, for usb, can be done just in the computer that has the drives mapped, by the wifi (in my case at a very low speed).
The ajaxplorer is the old version released last year, anyhow by default you can see just the ajaxplorer folder in the volumes and I was unable to go upper that level, so I had to create symlinks in terminal to point to the root of the drives, same for the usb...
Hope this brings more light here...
Thanks!