PDF Embed API loading some pdf and not others in a slides show like presentation.

Hi there, I have a storyline course using the webobject option to embed 18 pdf policies, one policy in each slide using index.html files and the PDF Embed API coding. The policies and the index files reside on our company server together. When accessing them from the server the index file opens the policy every time without fail for all 18. However while testing the storyline course, it randomly shows some policies and not others, and it is never the same policy with every try. Sometimes it's just one policy, sometimes it's three policies-there's no rhyme or reason to it and its always on desktop/laptop, on mobile every policy works as it should they populate in the iframe. On desktop/laptop I have to refresh to get them to load or go back one slide and then click on the slide that didn't load again and it will load as it should. I am not a coder...but I am looking for coding that would allow the index file to see that the pdf didn't load in the iframe and reload the iframe after 10 seconds...Is this possible? Or does anyone know what could be causing this problem-could it be an internet connection issue, a server permission issue maybe, any help would be greatly appreciated I've been testing this for days now and can't find a solution online anywhere to my problem.