I created an Azure Storage account using the Resource Manager model (the new portal), and now I'd like to configure a custom domain for blob storage. The documentation says to do this using the old portal (for Classic accounts), but my storage account doesn't show up there (because it's a Resource Manager account and not a Classic account). The new portal also doesn't provide a way for me to set the custom domain; it just points me to the storage page on the old portal.
Any idea how I can set a custom domain for blob storage?