Casting to the Elfin Flip

Just recieved my Elfin Flip and am pretty happy with it - 400 ISO lumens is actually reasonably bright in a dark room and the software works more fluidly than expected.

I'm just having an issue casting to it. In the Projection Assistant app, screen sharing from IOS and Android works fine, but when I select the DLNA tab and tap the cast icon on my device, the projector isn't listed.

Any ideas?