I realized that I do not have a mark as shipped button because the order in question was an instant download. When I have a product that is not instant download, the mark as shipped button is there.
But, I do have a question. With the instant download orders, the order column shows “NA” as the shipped status. Do you know of a code that could be added to change the “NA” status to “YES” if a customer buys an instant download order?