Hello
I haven’t dealt with animation from blender to unreal in a long time but isn’t that just your armature? As far as I know it doesn’t cause any issues regarding animation.
I did a quick test and see the screenshots below. I just have a single bone but named my armature and the bone something different to see how it imports into Unreal. While there is only one bone Unreal gives me 2 bones to select which affect the model.
Not sure if this helps at all.
