BTW, for converting Mixamo root motion (e.g., root motion is on the hip bone instead of the missing root bone) this Blender script seems quite nice: https://community.mixamo.com/hc/en-us/community/posts/115000239174--Tool-Batch-Convert-Mixamo-Animations-to-Unreal-Root-Motion-Fix-
Direct Github link: GitHub - enziop/mixamo_converter: Blender addon for converting mixamo animations to Unreal 4 rootmotio