This video was created to help those who have purchased Unreal Engine marketplace characters that come with multiple parts set up as individual skeletons. For example, Base mesh with a skeleton plus a backpack, helmet, jacket, & hair with their own skeletons. All of the accessories will share the single skeleton of the main character.
The character used here, "Cyberpunk Samurai", was created by Fajrul Falakh.
Check out his other works on Artsation: https://www.artstation.com/fajrulfnf
His models and assets are highly detailed and polished. Check out all his assets on the Epic Games Marketplace! Link to the Unreal Engine documentation that supports this video: