When you mark products as received in a purchase order you can automatically increase quantities in your store. It's an optional step and we don't increase quantities automatically when you click on "Receive" button.

After marking your products as received you will see "Update quantities in Shop" button that starts the updated wizard

When you launch the wizard we pull new quantities one more time to make sure we have the latest ones and you will be able to choose products for which you'd like to increase the stock. 

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