Matt is describing a "push"; that is, he's accessing his NAS and telling it to send a stream to a particular device.

I was explaining a "pull" (in my last post); which was telling my receiver to go get a stream from someplace (in my case a NAS).

I tried out the Yamaha app on a Google device and it worked fine - I used my cheapo tablet to control the Yamaha and select the NAS, then browse my music folders and select an artist/album. Basically it was just like using the receiver's remote, but without the TV. It wasn't fancy, no cover art or anything, but I had easy and readable access to the music.