When you import a skinned mesh with the “custom” method, it creates a model which contains an initial poses folder, an animation controller(both of which I have never needed to save), a part called “RootPart” which the bones are parented to, and a MeshPart which is the object in blender(in your case it is called “body”). I did not see the RootPart in your pictures so either you deleted/renamed it, parented bones differently, or the animation editor imports differently than it used to. So your problem might be what you did to the rig after you imported it, or how you set up the rig in blender(which doesn’t seem to be the case). I could be entirely wrong though because I can’t try it out right now. If you still can’t get things to work then attaching a full image of the model right after importing it will help. Good luck 