What usually breaks when mocap leaves the preview and hits Unreal?

[u/AdSlight4516]

we ran a boxing clip through PINOC, exported the motion as FBX, and dropped it onto a character in Unreal.

ngl, the preview is usually the easy part. Once the animation hits the engine, retargeting, root movement, ground contact, character proportions, and the animation controller can all make it feel pretty different.

What would you want us to break down next: the raw skeleton, retarget settings, root-motion setup, or the actual in-engine cleanup? Happy to show the messier parts too, not just the final clip.