Included in today's update is a better tutorial on using OneDrive storage with the Music app, as well as a small tweak to the way offline playlists handle music from different sources.
While the change log in the store simply lists bug fixes and performance improvements, Microsoft detailed what those are on the Xbox Music UserVoice page:
Better explanation of how to get started with OneDrive in the Music App on Windows Phone 8.1.
When you set a playlist to 'Keep playlist offline' it will automatically download all streaming tracks, whether from Music Pass or OneDrive.
As a recap, Microsoft recently started allowing Xbox Music users to store their tracks in OneDrive with a storage limit of 50,000 songs.
In any event, you can grab the update from the store link below to snag some better OneDrive integration.
Thanks to everyone for the tips!