I made an animation with keyframes in Blender with a rig and exported it to a FBX. I then loaded it in into UE4 and I just saw the mesh fine (except for the materials, but that is another story.). So i clicked on the animation and suddenly in the editor window, he played the animation, but I only saw the background. When I switched back to the mesh, I also didnt see something.
EDIT: Same problem: