Sling is a data transfer tool for copying data in and out of databases in large volumes
BigQuery
Initially had some issues when using Sling with Google BigQuery.
Azure Blob Storage
Copy the SAS URL from the authentication panel in azure portal and remove the container name. For example:
https://storageaccountname.blob.core.windows.net/containername?sp=....
becomes
https://storageaccountname.blob.core.windows.net/?sp=....