I transferred three FLAC albums to my phone, and NONE of them show up. I can't find them within Groove music, and I also can't find them using the built in file explorer on windows phone. Yet, I know I transferred three FLAC albums to the device.
You know what, never mind....I don't know what happened...I reconnected my phone, and could not find those albums anywhere. I copied them again to my device, now they show up, they play, and all is well. Cheers!