If your NAS is connected to a computer running Spark you can access your music through Spark on your smartphone/tablet. I believe that is the only solution for the time being.
Living room: Sigberg Audio Manta/10D subs, MiniDSP SHD Studio.
Den: Sigberg Audio SBS.1/Inkognito subs, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage
Den: Sigberg Audio SBS.1/Inkognito subs, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage

