>>359539328
Static meshes aren't linked to the skeleton at all, and don't have any animations on them. They have to be parented to the bone in unity by dragging them to the bone they should move with (usually head, chest, or hips). You can export a mesh as a static mesh from Blender by removing the "Armature" modifier before exporting the .fbx file, though you also have to make sure the mesh doesn't have any shapekeys on it.
You can also just add static models in separate .fbx or .obj files after you have the model in Unity.