Physics Asset Bodies Not Connected?

I’m attempting to set up a physics asset for my character. All of the bodies and constraints seem to be in place and I have all of the bodies in a physical animation profile with the settings suggested in this video. When I simulate all of the bodies, all seems to work as intended, however, when I simulate everything except Torso_Mid, the arms drop down toward the waist. Does anyone have any idea what I might be doing wrong?

I believe I figured it out. I had to add a body to my root bone and constrain the rest to that. Probably what was happening was my arms were children of Torso_Mid, but it wasn’t simulating.