Thumbnail error

Hi,

thank you for the patience.

To determine which scenario you’re in, verify these things:

1. Are the PDF files publicly accessible? Open a PDF URL directly in an incognito/private browser window (not logged into WordPress). If it loads — thumbnails will work. If you get a login redirect or 403 — thumbnails will fail.
2. What type of authentication protects the page?
3. Check the browser console on the protected page Open DevTools → Console while logged out (or in incognito).
4. Check the Network tab In DevTools → Network, filter by the .pdf extension and reload the page. Look at the Status column for each PDF request. Anything other than 200 means thumbnails won’t render.

The real risk is only if you have users who can see the page/gallery but whose session doesn’t grant access to the raw /wp-content/uploads/… PDF URLs — that depends on how your membership/auth plugin controls attachment access.

Let me know and we’ll solve it 🙂