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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Imported mesh does not look smooth - Pipeline & Plugins - Epic

render – Oded Maoz Erell's CG Log

Problem when importing Smooth Shaded object from blender

Unreal Engine Help Desk as you see the alpha texture have smooth

Smoothing on objects not working (from blender to UE4) - Asset

Smoothing issue with static meshes from Blender - Rendering - Epic

UE4 – Technical model visualization tips – Oded Maoz Erell's CG Log

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Smooth Vertices — Blender Manual

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