EDIT: Nevermind. I realized a post below mine addresses my question for the most part.
See:
Shiu wroteSkinning is not yet implemented in the Unity runtime. It won't be long before runtimes are updated though. You can use Pharan's version of the unity runtime for now which should support both FFD and Skinning, and then switch to the official one once we have it updated (if you prefer to use that). You can find Pharan's version here. https://github.com/pharan/spine-runtimes/tree/unity-ffd