How can i generate .uexp file in unreal engine?

Can anyone please let me know how can i generate .uexp file in Unreal engine project

Hi Harish, you could find out how to export .uexp. I too need it to load the map in /opt/carla-simulator, as of now its failing for me as it says serialisation fails as the data is corrupted and i have umap and not .uexp. Please let me know