@mommdc, @AwesomeOpossum, @scarednexcited,
I would encourage you to plan on having everything ready to submit together or as close as possible. Our application is undergoing some revision this summer and I am not sure how the process of submitting supplemental materials will or will not be adjusted. In the meantime, visit Pitt, enjoy your summer, etc. If you join our email list or reach out on social media, we will reach out in late summer when the new application is posted!
Best,
A Pitt Admissions Staffer