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

Toddeh Tovmasyan - The Good Samaritan — Experience points

How to export from Blender to Unreal Engine without the smoothing

Blender: Smooth Modifier & Other Techniques – Simply Explained

Blender] Same model but different shading quality? - Asset

Tools, Toolbar and Tool Widgets — Developer Blog

Blender -> UE5 meshes become smooth : r/unrealengine

Cycles Render issues, smoothing normals - Lighting and Rendering

Problem with import smooth object from blender - Pipeline

Smoothing — Blender Manual

Creating a Real-Time Cinematic Character in Unreal Engine 5

VR Production Tools, Workflow, and Pipeline

The Future of Character Animation — Developer Blog

Skeletal Mesh Editor Epic Developer Community

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