I suggest to use the Total Commander for it. You can use it simply as file manager and ftp manager apps. You need choose the network mode first and then you need choose the N3200 item as network resource, and then you will look and edit all directory on the NAS
I use WinSCP. Turn on FTP on the NAS Connect winSCP using FTP Forget the local machine in the left hand pane The right hand pane will list all your folders on the nas Go into USBCopy folder and navigate to the folder or files that you want to move. Select folder(s) and file(s) Right click and select move to Enter Target i.e. Music will be /Music/*.* and Voila Moved in a matter of seconds.
Took me a while to figure it out but saves hours of network traffic.
Hope this helps. shout if you need any further help. Its about time people started helping others on this forum. I never nearly bought this NAS just because other suppliers had decent forums and a good community.