https://ibb.co/k9kgNLf
I Group 2 Block and then Export to Unreal "FBX" and check "Merge Blocks" in asset forge 2.1.
In Unreal: Import and uncheck "Generate Lightmap UVs"
Could you explain the actual problem you're having? It's hard to tell from your screenshot or description.
The UV isnt in that, and in game after Build Texture Getting Darker. The UV should be in that Box.
For UV mapping please refer to our tutorial available here.
