Help! Application “incomplete”

I got an email recently that my app was incomplete but I’m missing “home schooled documentation”. Upon research it seems a super extensive documentation for taking online courses. I took one online to fulfill my high school health credit freshman year, and most of the stuff they’re asking for I have no idea where to start. I emailed admissions asking for further understanding but will the lack of these items hold me back in admissions?

Call them if you don’t hear back from your email and if the website is not clear.