Try unwrap on new image and Bake Textures. Usually Export UV Layout is used from UV editor menu. But if you want sort by certain material Bake Textures will help. It’s on Render tab, bottom part.
thanks for the help. im trying to build a quality first person weapon model and tried smoothing the edges. it gave me a lot of headache with ngons and especially trouble with uv mapping, do you guys have suggestions how to make the model edges smooth manually ? im trying to make a cadian lasrifle so the gun is pretty uneven for extrusions so doing it manually to look smooth the same on all edges is kinda tricky…