Missing part/mesh after importing fbx animation. (Blender)

I downloaded a fbx animation of a hand reloading a weapon. In blender I opened the fbx file and added texture to the hand and weapon. I selected the export fbx option and exported with ‘bake animation’ selected and added a root. When I import this animation to UE4 the weapon is missing, but the hands are moving correctly. Inside blender all is normal.