UV mapping not exporting with Blender Send To Unreal

Hi, I’m experimenting with the Blender Send To Unreal plugin, and I’ve got a couple of meshes (simple cubes) that won’t correctly bring in my UV unwrapping - they just seem to do their own thing once in Unreal. They’ve been modelled the same as other meshes that work, and have the same shader setup. Any guesses where I should be looking for the issue? (And is this the best place to post? Can’t seem to find a dedicated forum)