Sceletal mesh issue after migrating to UE 4.21

Development Rendering
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Hi guys,

I also had this problem and found the information in the forum: For SM4 (D3D10) and SM5 (D3D11) the maximum influence is 8. For ES2 (Mobile), the maximum influence is 4.Your 3D object (SkeletalMesh) can not have more than 4 bone (joints) influences per vertex, so you need to correct it in the 3D modeling tool (Maya, Blender, etc).

[Ref]
https://forums.unrealengine.com/development-discussion/content-creation/4089-skeleton-meshes-max-bone-influences