Learn two methods for ragdoll physics for filmmaking / cinematics. Method 1 uses Unreal’s default character Manny since he’s already rigged for physics, then you bake the simulation and retarget a custom character onto that animation. Method 2 shows you how to set up a physics asset for your custom character from scratch, more complex but much better for multi use characters or live use, such as gameplay.
https://dev.epicgames.com/community/learning/tutorials/DWyX/ragdoll-physics-for-filmmaking-beat-yourself-up-in-unreal-engine