Here’s how you can auto-rig your 3D model (FBX) with no prior experience—just a few clicks! Simply import your Static Mesh and let it do the work for you. The skeletal meshes can be used in Unreal Engine, Unity, Maya, and Blender.
https://dev.epicgames.com/community/learning/tutorials/2OkB/unreal-engine-auto-rig-a-3d-character-the-easiest-way