I have an animation and skeleton from Mixamo where the character falls to his knees and then slumps over. It was working fine UNTIL I retargeted a UE4 mannequin anim to it. Now the hips dont move at all and the character ends up floating in mid air when lying down. Is there a setting I accidently used? I set the root to none in the retargeting for the other anim and it too doesnt have hip movement. All anims now have no hip movement.
Go to the skeleton settings and set the hip to be animation scaled - or set to skeleton, depending.
That will likely fix things.