Lituanhui, hm not sure, as I don’t have Maya. You might have to wait until Epic releases the Metahuman Creator, since a Maya file will be included when you download each human. To quote from the Unreal blog: “When you’re happy with your human, you can download the asset via Quixel Bridge, fully rigged and ready for animation and motion capture in Unreal Engine, and complete with LODs. You’ll also get the source data in the form of a Maya file, including meshes, skeleton, facial rig, animation controls, and materials.”