The reason your animation didn’t work is because you didn’t retarget the skeletons first, which is why it didn’t show up in the list of compatible skeletons. Come on guys… that is retargeting 101.
On a side note, don’t even bother with any of the animations as they cannot be retargeted “correctly” anyway, simply because the skeletons do not have a root bone at the feet like the UE4 skeletons do. So it is near impossible to get them to work properly.