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Level Design having a little noob issue

Iam having issues when creating terrain.
I create the layer, have it looking the way I need with hills and valleys, save.
Add some temp light so can see a little in the map to make sure its looking good. Add spawn points. Rebuild. Save
Then test play to make sure the terrain looks ok in RO before going on.
I get a warning message just before it launches to play - unable to find texture. But it still loads in RO, just no nice ground cover defaults to the original texture I used to create.)

I can create a box add texture, door, static mesh and test this ok. What am I doing wrong with creating terrain, or do you need to do something else when saving. ?