And this is a big misunderstanding.. what they mean is: you can control songs that are saved offline on your iPhone with your Apple Watch. Nothing can be saved on the Watch itself.. at least I can't find this option anywhere
So it seems you are right. I downloaded the app and couldn't find the offline option on the watch or the iphone. I read this on several articles. Unfortionally they are in german and it seems they are all stealing content from each other.
So it seems we are all prisenors to apple music...
Im a fan of spotify as well as apple. I bought a new apple watch. But I came to know that there is no spotify app for apple watch. I'm really disappointed with this. Please do release the apple watch version too. Hope you will.