In UE 4.14+ there is an additional step required!: • Video
This video shows the basics of UE4 retargeting system. This is a tutorial showing how to retarget animations from Epic's default skeleton (the "robot") to a character made by Mixamo, which uses Autodesk HumanIK skeleton.
The skeletons are just an example, this tutorial will work for any humanoid skeletons. It also doesn't show anything new, I just read the retargeting manual (https://docs.unrealengine.com/latest/...) and executed it in this video.
I hope it helps!
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www.kubold.com
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Music by Kevin McLeod (incompetech.com)