When you don't want to add a custom shipping amount to the invoice, you can now associate a Shipping Price to an individual inventory item. Once the customer adds this piece of inventory to their cart, they'll be able to see the Shipping Price associated with the inventory they're looking to purchase.
You can set this Shipping Price on the individual artwork record under the Financial tab of the artwork:
Please note: This shipping cost will only populate on your ArtCloud website checkout as a flat rate. Leave blank if you wish to add shipping after the invoice draft is generated.