Reply To: S3 URLs entry Metabox Render problem
The new URL format resolves to the S3 URL. The purpose of the new format is to allow for more control over who can access the URLs, and to avoid expirations in email notifications.
If the links are giving you a 404 error, you can head to your admin –> Settings –> Permalinks, and click the save button. Don’t change any settings, just click to save. This will force a refresh of your site’s rewrite rules.