Can't start spotify on my smartwatch when spotify is in offline mode?

[user-removed]

I can't start up spotify from my smartwatch when the offline mode is enabled in my spotify app on my phone. I have the offline mode on quite often to reduce data usage. I don't understand why I can't start up the app when it's in offline mode though, since I'm just trying to start the phone app through bluetooth on my watch? Anyone knows how to fix this?

To clarify: I'm not asking to be able to have music downloaded on my watch for when my phone isn't connected to my watch. I'm asking to be able to start up the spotify app from my watch, when in the settings off the app offline mode is enabled. My phone is still connected to the watch.

[Joe]

What watch and mobile are you using? Is it the same with wifi turned off on the watch?