Can you open the developer mode in the browser and go to the network tab and monitor the API request that is having problem? Check the response probably there are some errors there.
It appears to have completed successfully, indicating 10.4 MB was downloaded in 22.38s. I was under the impression the log would download to the local machine similarly to the Import/Export configuration functions. Is there somewhere else I should look for the log file?
You should be able to download to local your logs from the Kubernetes deployment too.