HTML5 Ads Showing Blank

Hi everyone,

I’ve been using the Advance Ads Plugin for a couple years now. Recently, we had an advertiser who wanted us to use their HTML5 Ad. I did some research and came down with this guide by Advance Ads.

https://wpadvancedads.com/manual/adding-html5-ad/

I went for Method 2: Using iframes for HTML5 ads. I copied the files via file manager to my site and it has been working until lately when it just shows a blank white page. As I was troubleshooting, I found out that the link to index.html shows a blank page. When you click on it, it still takes you to my client’s website. Any ideas why it used to work and then stopped working? No changes has been made to the files. I’ve turned all caching off as well, and nothing changed. Thing is, when I download the files and run it from my desktop, it works. Just not from the links below. Thanks for the help.

https://themislabeledspecimen.com/wp-content/uploads/html5/TechLab_Q1_QuickCheck_Poll_300x250/index.html

https://themislabeledspecimen.com/wp-content/uploads/html5/TechLab_Q1_QuickCheck_Poll_320x50/index.html

https://themislabeledspecimen.com/wp-content/uploads/html5/TechLab_Q1_QuickCheck_Poll_728x90/index.html

https://themislabeledspecimen.com/wp-content/uploads/html5/TechLab_Q1_QuickCheck_Poll_160x600/index.html