Question 2D Animation Auto Geometry doesn't create geometry for entire sprite.

So I am trying to rig a 2D sprite up using the Unity skinning editor. I create all of my bones and link them together using the transparent thingy and then hit auto geometry and it only creates geometry for the torso of my sprite.

I am using a sprite where all the limbs are separated, like in https://blogs.unity3d.com/2018/11/09/getting-started-with-unitys-2d-animation-package/ <- this tutorial.

Am I doing something horribly wrong? How can I get it to create geometry for the rest of the sprite as well.

I was going to use the character rig options shown in a Brackeys video but my editor doesn't seem to have it.

Thanks.