I got the test and I put it on 2 of my NAS and a portable drive (PNY Elite 480GB SSD)I have never done the surround test, I'll try on my end later today and see what I get.
My Oppo reports that the MP4 is not supported from any source, my Sony UBP-X800 will play the MP4 but from my Buffalo Nas are very choppy, from the portable drive into the front USB of the X800 it plays OK but with one glitch. From my WD MyCloud are choppy and no sound, very odd.
I have the Matt Darey - Wolf MKV but it won't play that. It will however play the individual MP4 files.
How are others playing the MP4 files, what Windows PC program plays them?
It's Atmos I'm interested in mostly, I've had Mr. Afternoon's toad 5.1 flacs from there, they are OK.
Any help gratefully received, until I'm sure I can play these files properly I can't buy Atmos from IAA.