>>373876364
Hmm, sorry I must have explained it confusingly. I import the original fbx into blender, adjust the bone, export the new fbx. Just to check that they are the same, I drag new fbx and original fbx into scene and they look the same. I click each fbx and the properties on the right side panel are all the same, but when I overwrite the original fbx in its original folder with my new fbx, the prefab the fbx is based on is invisible (but I can see the bone spheres)