My users need to see my PDF displayed in 3D Flipbook format before they can recommend changes.
So I end up switching out PDFs for the same Flipbook fairly often.
I love being able to do this so easily -
once I've changed the PDF in the Media Library, I just go in the 3D Flipbook and reset the PDF setting.
My only problem is that I'm using auto-thumbnails, and I often find that the thumbnail for that Flipbook has not changed.
I found the auto-thumbnails file in ...wp-content/uploads/3dflipbook/auto-thumbnails,
and found that deleting the thumbnail for that flipbook solved the problem;
the correct thumbnail was then created.
Would you be able to change your code, so that changing the entry for PDF in the back-end for a 3D Flipbook would delete that thumbnail?
That would make my life easier!
Thanks so much for this wonderful tool!