When I deployed the webserver, I changed the value https://github.com/allegroai/clearml-helm-charts/blob/main/charts/clearml/values.yaml#L36 to be the public file server URL. Then in the UI, I copied the blob from the settings/API keys. Which had the public URLs. After that I did my data uploads which worked fine as they used public URLs. The problem is due to tight security on this k8 cluster, the k8 pod cannot reach the public file server url which is associated with the dataset.