When apps are closed and I press play on my watch (the phone controls), it opens the Kindle app. Spotify is always open in the background/notification shade, but hibernates, and Kindle is not open when this happens (it's almost never opened in any case).
On my Venu Sq there was the same issue - pressing play on the watch would sometime start YouTube Music on the phone, even when it was closed (I don't use it) and Spotify was open, but usually it would also open Kindle.
If Spotify is active or paused, the controls work fine. It would just be nice if I could start up my music from the watch when Spotify does (or whatever Android calls it now). Is there a way to make the watch not call up the Kindle app?