Hello there, @Adazzlingmess13 ...
I tested this in my own sandbox course. I created a quiz that had three questions: two essays and one file upload. Then, I logged in as a dummy student to take the quiz. I answered the first two essay questions, but then I purposely did not upload a file to the file upload question. When I tried to submit the quiz for grading, I got the following pop-up message on my screen:

Do you recall seeing any message like this on your screen prior to submitting the quiz? As you say, you were able to contact your instructor right away to explain the situation...so all might be fine.
Hope this helps a bit...take care, and be well.
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