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Scroll to the bottom of the Item Editor screen to the Advanced section. There you will find the "USPS Media Product Type field".
Choose the product type required for this shipping method. Click Save.
Test your cart again.
...
...
Scroll to the bottom of the Item Editor screen to the Advanced section. There you will find the "USPS Media Product Type field".
Choose the product type required for this shipping method. Click Save.
Test your cart again.
...