PDF Embed Not Showing

Hi there! I'm trying to get the Embed API set up on our site, but I'm running into some issues. It seems like it works the first time you open the page, but on reload, it disappears sometimes. I have it set up here: https://annescollege.fsu.edu/embed-test

When I'm logged in to edit the site, it won't show, regardless of how many times I reload the page. We're using Drupal to manage the site.

Also, when I'm viewing on an iPhone, it won't go full screen on both Chrome and Safari. Attaching screenshots of this issue.

I'd appreciate any insight, thanks!