Really?Are you sure?
Yes, I'm sure. DD, DTS, AVC, DTS MA, True HD Atmos 7.1 MA, ISO.... What more you need?! My device (MED800) works superbly in conjuntion with Denon AV receiver, from 2012 already. No need to upgrade even.
Photos from my Sony Xperia Z5 is not supported. Many other video/photo formats are not supported.
What video/photo formats you mean? Please name "Many others formats"! As far I remember it palys also DiVX, MP3, MP4, etc...