I am not a professional but exporting with fbx will bring the material and some of its values usually, that being said it is very common to have to rebuild materials inside of unreal itself. At least as I’ve found. There are some ways to make it get closer but the one I see touted most is baking the materials to a texture then applying that texture but still you’ll have to rebuild for the most part. Here is another question asking something similar. How to Use Textures from Blender - #3 by MondRubberduck