Well that's disappointing, and I'd say that the fact they advertise "NAS" functioning is very misleading then..
This is what it says on their site:
"Built-in NAS function: Access files on attached storage devices (HDD, USB drive, etc) from local network (via SMB, FTP, UPnP/DLNA)"
Current Gear: Anthem AVM60, D-Sonic 3500/7, Oppo UDP-203, PS Audio Nuwave Phono Pre, Technics SL1210 w/ Denon DL103, Dune Duo 4K, Vizio 75" 4K, Paradigm Sig. S6 & C3 v.3's, Studio ADP's, Velodyne SPLR1200.