I have two different quizzes that I'm trying to edit, and with both of them, I keep getting a page that says "504 Gateway Timeout" after hitting the "edit" button. Nothing else is on the page.

Both quizzes are rather large. I have previously edited both quizzes successfully, but I have now tried multiple times to open them to no avail. I've tried quitting and re-opening Chrome. I've tried opening (one of them) on two different days. Anyone have any ideas what else I can try?

[Disclaimer: if I need to do something "techy," please give me a very detailed description. I can follow directions, but if I'm doing something involving coding, I have no idea what I'm doing.]

Thanks!