Acquiring an item as "ready for resale" does not automatically add it back into inventory, unless the Enable Item Restocking button inside of collector is active. If Restocking is enabled, it will automatically update the inventory inside of Shopify. To set up automatic Item Restocking, navigate to Settings>Collector>Configure>Options, or Click Here.
Once you have enabled item restocking, you will have the ability to select "Restock" in Collector.
*If there is an error code presented while trying to restock an item, please contact customer service. Your configuration will need to be updated by our technical department.