Some files not playing due to audio track

[christiaanvdlaken]

I tried unchecking but that didn't work initially. I changed some setting on the android phone app. under clientsettings i set video player type to integrated player. Now it seems to work but it seems strange because I would think those are settings for my android phone ?

I don't really understand the following, could you explain?
And set downmixing to the appropriate max for optical cable supports. 5.1?