Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
The two values that you need for adding an item are:
As the documentation for ShippingServiceCodeType is out of date you need to use the API to get the correct values.
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Listing not showing on Seller Account in Sandbox,Listing not showing on Seller portal in Sandbox
ShippingServiceOptionsType depending on PaymentMethod
Trying to put sold items on access database or things like that
Does listing in production require app certification or do you just need certification to raise limit over 5,000?
BUG: Incorrect calculated shipping for USPS First Class International Package vs Large Envelope