I would be interested in this feature too. In the situation @susan_working describes, which I also face, some students will have one file, some will have many. My solution has been to add multiple extra file upload questions with 0 point value in an attempt to make them optional. Unfortunately that causes the quiz to continue to show up as "ungraded" until a grader goes in and explicitly enters 0 into every one of the "optional" file upload questions. It also causes students who upload just one file to be told they have not answered every question when they go to submit.
(I've begged my students to get either a free scanner _or_ a free zip file creator on their phone, but many will not. Not even when I point them to a specific cost-free, ad-free, in-app-purchase-free, nearly permission-free scanner app made by a well-known company best known for a certain dominant operating system and office suite. 😉 )
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