do you know if the rig maps onto unitys humanoid rig? I believe you’re using unreal does it map onto unreal Humanoid rig(can’t remember what it’s called). It would be nice to see how you remap the bones for retargeting in both or either engine
yes I export it with the settings for unreal and when you import it just make sure it's set to the mannequin skeleton and it'll work just fine.