Retarget Manager- Humanoid rig don't appear - Skeleton needs to be saved

Hello. I’m learning UE4 and trying a tutorial. Everything is going great. Animation works and there are no problem. But when I try to retarget, I just can’t. :frowning:

I’m trying this tutorial:

The problem is happening on 3 minutes 31 seconds of the video. On 3:45 he select the humanoid rig. In the bottom right the same message appears to me, so it sholdn’t be the problem.

On the left, appears to him the humanoid rig (root, pelvis, spine_01, spine_02, spine_03). It don’t shows up to me. I select the humanoid rig, and I can’t see this list.

I’m using the 4.16.3. I exported the Mixamo fbx to Blender and after that I exported the fbx, and fbx animations to UE4.

Can someone tell us how to get this sorted

Can someone tell us how to get it to work