Smoothing issue with static meshes from Blender - Rendering - Epic

I have been searching online for over a day and trying a heap of different settings and fixes to solve this issue, but unfortunately my lack of understanding/knowledge about smoothing/normals must be giving me trouble. There seems to be plenty of posts about similar issues but nothing seems to be a fix for me. I have made a high poly sculpt of a large rock, followed by a retopo into lower poly ready for UE4. I then export the low poly from blender as an FBX with the model set to smooth shading

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Problem when importing Smooth Shaded object from blender

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Hi guys, check out my take on Niagara crowd simulation. 20k fully