You can verify your Amazon connector if it includes the option to sync inventory levels automatically, @atozshopus. Let me provide some insights below.

First, it’s essential to know that QuickBooks Online (QBO) is the only receiver of the data and relies on a third-party application. I recommend checking how the accounts are mapped in your Amazon Seller Connector to ensure that inventory levels automatically sync after sales.

You can also check this resource to simplify your bookkeeping tasks, allowing your business to focus on growth while maintaining organized financial records: QuickBooks E-Commerce.

Additionally, I'll share this article to give you valuable insights into your buying and selling activities, along with an overview of your inventory status: Run reports for sales and inventory status.

Please let me know if you require additional support about QuickBooks auto-update inventory level every after-sale. I’ll be around to lend a helping hand.