have problems import fbx files from blender to unreal 4.23. it tells there is no mesh.
There is definitely something wrong in the way you save the mesh in blender (because the file is so small). Make sure the whole mesh is exported.
Also when exporting if you see just below the window frame at the right you can see your vert, face, and tri count, and all of them are 0, are you sure you’re selecting your mesh right?