The armature in Blender has “bone rolls” that are fundamentally incompatible with the Epic skeleton in Unreal Engine such that if you exported a mesh and armature to UE using FBX then try to “retarget” an existing animation to your armature (now called a skeleton in UE) then it becomes a very warped mesh during the animation play through. Even if your bones are correctly named and have the same hierarchy as the Epic skeleton (which is the skeleton that the free animations are based on).
But a clever guy called Rakiz has written a script to fix this (available at https://www.rakiz.com/uefy/ and I’ve purchased it) but here is how a fixed armature looks in Blender:
Would it be possible to have this feature built into 2.81 but with the bones looking more normal, if you get my meaning, rather than sticking horizontally outwards like this? How can I request it, please?
If Blender can be made more easier to work with the Epic skeleton then many people can create Epic skeleton compatible humanoid meshes (skeletal meshes) for the Unreal Engine marketplace (which is one of the UE marketplace rules when creating and selling humanoid meshes) which would obviously help to increase the popularity of Blender within the game development industry.