Hi,
There will be an "artist" level folder on the B2 called "Unknown" into which the albums have been placed.
You can see this in the Web UI simply search for "Unknown".
One point. PLEASE do not make the B2 do two things at a time - down that path there is much wailing and gnashing of teeth!! So if you are loading - load -- but DO NOT play music at the same time.
You see the little Raspberry Pi in the B2 is only small and while it CAN multitask, our experience on this forum is that, if you ask it to do so, bad things can sometimes happen.
Fred