Is there any way to use baked normals AND a premade material?

If someone could please explain to me what I’m getting wrong here it’d be much appreciated. I am attempting to model some weapons and import them into UE4 as low poly models with high-poly normal maps baked onto them. I’ve successfully done this with a cube, giving it a normal map that includes the high poly detail, but my normal map is stuck to the base material as it comes into Unreal. Is there any way to use a baked normal map to smooth out the model and then later apply a material on top of it?

Can you show us an example of the material editor (with the normal/diffuse shown) to see what the problem is?

I’ve got the end result I wanted by adding the baked normal to the normals in the premade material, but what I’m attempting to do is not have to modify each material to include the object’s normal map.

I solved the problem, I was modeling in Blender without smooth shading, so everything ended up looking like it was from 1996 when I brought it into UE4. I didnt realize smooth shading averaged normals so I was attempting to compensate with a baked normal map. It’s all good now.