If you go via the Naim app, Server, Local Storage it works... But in my case with a regular HDD that holds 3tb worth of audio files it takes forever.
while it may work, i don't think these streamers are meant to be connected to tb or multi tb external hard drives. i have a large external hard drive which i use when listening to music through my computer (foobar2000>usb>teac 701n) but use a 512 gb usb flash drive, with a portion of my music, when using the teac sans cpu.