Hey
So I created a test terrain to import - I have a few questions though :
1 ) In this guide : https://wiki.unrealengine/World_Machine_to_UE4_using_World_Composition#Tiled_Build_Setup
It talks about weightmaps, but just says to set them up. What are they for, and why do I need them?
2 ) I want to paint my terrain in the unreal editor, I would have thought it would have been a fairly straight forward process, but when I do it, nothing seems to happen?
Okay cool - If I am not using the world machine textures and want to use my own, do I need weight maps at all?
Weight maps are not textures, they just define where the textures should be -> but you can also paint the terrain by yourself 
Brilliant, I would rather paint them myself, I want to leave parts of the terrain with no material to highlight the areas that I want meshes for detail - it will also be used as a marker to say where I am in the process of detailing.
Thanks for your help sir!