I am using Spotify on HTC One M9.
When I restrict background data on my device it should force Spotify to use data only when on Wi-fi.
However Spotify is keep using my Mobile Data Plan even with this option ticked.
I know I can go offline mode and then make sure that I am go online only when under Wi-fi connection to download playlist and go offline again (and temporarily I will do that) however this is not what you would expect when you enable such an option !
So app should override system restriction ever.
Steps I did so far:
1) Uninstalled Spotify
2) Restarted the phone
3) Installed fresh Spotify app
4) Restricted data
5) Disabled my wi-fi
and Spotify is keep eating out my Mobile Data Plan :(
I also would like to highlight that on my older HTC One M8 everything worked as it supposed to work (when I restricted background data then Spotify used data only on Wi-fi connection)