Exporting from 3Ds texture map issue

Something I tried that worked was un-ticking the check box that says “use real world mapping”. This allows me to adjust the uvwmap. But the problem is when I go to bake my lighting un Unreal, it turns black.
And every tutorial I’ve watched to unwrap doesn’t mention anything about changing this setting. So I must be missing something.
I imported a simple desk model into my project tonight, applied textures and it does exactly the same thing. So I must be not unwrapping properly…

I watched another tutorial tonight where instead of using a uvwmap and uvwunwrap modifier, he used 2x uvwunwraps instead… maybe ill try that method after trying yours…