>>351075465
overwrite the fbx, if you don't: change meshes (number of meshes, names of meshes), add new bones, add new verts
nothing will change
moving verts occasionally breaks mats and all you gotta do is reassign them back to the model in scene and you're fine
anyone who tells you to not overwrite fbx's is a unitylet, the jankiest solutions are frequently the best when working with it