Brand Portal September 2019 Feature and Enhancements
Brand Portal's September 2019 most notably introduces Asset Sourcing, which increases content velocity and allows for easy and quick exchange of assets between Experience Manager authors and third-party creatives and contributors.
Brand Portal Asset Sourcing
Brand Portal's Asset Sourcing is used to collect assets from third-party agencies and teams, seamlessly syncing them back to Experience Manager Author for review and use.
See Videos: https://docs.adobe.com/content/help/en/experience-manager-learn/assets/brand-portal/brand-portal-feature-video-use.html