smoothed normal issue and segmented model

Hi folks, got an issue with polygon normals:
I took a skeleton mesh from a sample project form Oculus.
in UE4, the character’s normal is all-around smooth.
however, when I export it out and import it into Maya, the model is in patches, and the normals have clear seams(on the back and sides)
My question is, why there is no visible seam inside UE?
How can I get that smooth noramals in Maya?
thank you for looking into this.
Maya normal smoothing gives quite an headache.





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Thanks and regards
Lovellabennet