Spotify has previously complained that there was no API to transfer music to the local storage of the watch and play it back from there, but after the feature w

Spotify has previously complained that there was no API to transfer music to the local storage of the watch and play it back from there, but after the feature was added in last year's WatchOS update, they failed to add support for it. Now that cellular music streaming has been added in this year's WatchOS update, we'll have to wait and see if they will update their app to support that feature.