Metaobject exports resolve references to handles

Metaobject exports now convert reference field GIDs to handles or filenames, making it simple to import metaobjects with references across different Shopify stores.

🔧 Improvements

• Metaobject reference fields – now export as handles instead of GIDs, matching the behavior of regular reference metafields on products and other objects.
• Cross-store migrations – metaobjects with reference fields can now be imported to different stores without manual GID updates.

This brings metaobject exports in line with how other reference metafields work. Metaobject imports already support using handles or filenames instead of GIDs, so you can now complete a full export-import cycle across stores without editing your files.