Song Kong for Android please
Especially tablets. Apple to.
We dont have a native Android version but what you can do is install on computer, start remote mode and then you can open in web browser on your phone. (http://computeripdress:4567) and you can then control via your phone/iPad.
So this allows you to easily fix your music on your computer/nas from a mobile phone/iPad. It doesn’t allow you to fix the music on your phone/iPad but I wouldn’t expect that to be the primary location where you kept your music.