Importing FBX Skeletal mesh error in Unreal Engine

Hi,

I had bought an fbx model of a fighter jet. It was made in 3DXMAX, and it works perfectly in Maya and blender. But when I upload the model to unreal engine as skeletal mesh, parts of the model is missing. When I upload without skeletal mesh, i am not able to play the animation, and when i get closer, some issues with the model starts happening. I will attach an Image down below. Please if anyone knows a solution to this, let me know!
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