Idiots guide to Vero 4K NAS connection!

Right, I’ve just bought one of these to view (hopefully) a couple of 3D MKV’s as my ATV 4K doesn’t do it and I can’t be arsed getting the oppo from the loft.
Managed to do a factory reset and can see my NAS but despite my best efforts and with lots of swearing thats as far as I’ve got.
Anyone got an easy way to get my head around it and load movies onto it, looked online and am even more confused!

Thanks

tinyurlis.gdv.gdv.htclck.ruulvis.netshrtco.de