Hi @giocol62,
Thanks for reaching out.
This issue often occurs when resources (like PDFs) are still being loaded over HTTP instead of HTTPS. Here are a few steps you can take:
1. Update Embedded PDF URLs: Ensure that the URLs for your embedded PDFs use HTTPS. If they still use HTTP, browsers may block them due to mixed content security policies. Go to the Media menu on your WordPress dashboard and double click the PDF file to open its detail page. Then check the URL. If it’s HTTP and you are unable to update it in anyway, please re-upload the PDF and the new URL will be HTTPS which wouldn’t give you these issues.
2. Mixed Content Checker: Use a tool like a mixed content checker to scan your site for resources being loaded over HTTP and update them to HTTPS.
3. Update the “Site URL” and “WordPress URL” to use HTTPS: Go to Settings > General on your WordPress dashboard and ensure both URLs are loaded on HTTPS.
4. Clear Cache: Sometimes, cached data can cause display issues. Clearing your browser cache and any caching plugins on your site might help.
5. Security Plugin Settings: If you’re using security plugins, check if they have settings that could be affecting the loading of external resources.
I hope this helps. Thanks ??