I have a Samsung UE65ES8000 tv.
I have TV connected to a Sony anynet+ compatible DVD player which has surround speakers via the optical sound cable.
I have an amazon firestick connected to TV which plays fine through the surround sound DVD player.
I have a sky Set top box connected to TV via HDMI and the sound from this also comes through the DVD player.
However, when I use the tv remote and click 'source' and choose my Wifi connected NAS drive DS416PLAY and choose a video from there, it plays the video and the sound comes only from the TV, not the surround sound.
Is there anyway that I can simply have any sound from the TV go through the optical cable to the Surround sound system ? I just can't get the wifi NAS drive videos to go through the optical cable.
Any suggestions really welcome as I'm tearing my hair out right now. 
