If you experience issues with losing materials after exporting from Blender and importing into Unreal Engine, there is a simple solution.
To fix this problem, just export your file from Blender ...
How to add 3D model with 360 degrees view on website with JavaScript and Three.js in 5 minutes!
Source Code: https://redstapler.co/add-3d-model-to-website-threejs/
Three.js Crash Course: ...