Bulk Fulfill by Upatra allows merchants to update fulfillment status of orders through CSV files.
Merchants could fulfill by Orders numbers or via variants SKUs by declared them in CSV files. Those files should contain at least Order Number and Tracking Number (if fulfilling via orders), or Order Number, Tracking Number, SKU, Quantity (if fulfilling by SKUs).
Nonetheless, Merchants could also use their own Tracking URL to provide detail orders tracking status.