This is my first year competing in WWDC21 and I was wondering if anyone knows what devices your submitted project should be compatible with?

Hi, i'm very new to WWDC and i've never competed in the student challenge. I was wondering that when it comes time to submit process, what should I be submitting for the interactive playground. I tried to see if I could submit my xcode project but it did not let me. I know I'm under the maximum limit for the file size. Should I be submitting a video or demonstration of my project, or am I doing something wrong?