Why my leg bone is just a sphere on unreal engine after import from blender ?

Development Character & Animation
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1

Hi Everyone,

I have this result on unreal engine:

image
image1430×609 38.7 KB

All the LEG_X bone are just a sphere and I don’t understand why. Here is the bone on blender:

image
image1636×969 127 KB

I was expecting the same result on unreal engine ? Any idea ?