If you’ve ever imported a mesh into Unreal Engine 5 and you noticed parts of it was missing/invisible, you probably have some backward normals that need to be flipped. In this tutorial, I show you how to fix them directly in UE5.
https://dev.epicgames.com/community/learning/tutorials/p471/unreal-engine-5-how-to-fix-invisible-missing-faces-on-a-model-no-blender-needed