Merchant Center allowed supplemental feeds to be attached to automatic product imports

Merchants using Merchant Center's automatic product imports can now add supplemental feeds on top of them. Supplemental feeds were previously limited to primary feeds added by API or by XML/CSV file upload.

The change was flagged by Emmanuel Flossie of FeedArmy on LinkedIn. Automatic imports crawl product data straight off the website, so until now merchants on that setup had no supported way to override or enrich individual attributes without moving to a file or API primary feed. Attaching a supplemental feed lets them patch titles, custom labels, promotion IDs and similar fields while leaving the crawl in place. Google has not published a change log entry for it.