Aperture won't import from my network drive
Aperture can *see* my external RAID drive, that I connect to wirelessly via the Airport - in so far as it has just allowed me to make a new vault on that drive. But when I try to import a photo from that drive, it simply doesn't appear in the list of places that I can import from. Why doesn't it recognise it as available? Do I have to 'add drive' or something? Sorry if this is a really dim question.
MacBook Pro, OS X Yosemite (10.10.4)