I’ve been looked at the samples for the Sharing Skeletons in the Unity Editor and have tried to recreate it. I’ve set up sprite libraries, but when they swap the rig acts weird and a bunch of bones disappear for some reason. I have no idea why this is. The rigs both share a skeleton component, but it isn’t working with the variant. No idea what’s causing this.
It might be because of different bones order between the sprites. In the Skinning Editor, you can adjust their order using the bone influence tool.
It is also useful to turn on the auto rebind on the Sprite Skin so that it will attempt to rebind to correct bones automatically.
If you are stuck feel free to share your setup with me in a private message so I can take a look.