One of my colleagues batch uploaded a number of PDFs of our university magazine, but the thumbnails show the negative of the cover. However when we go to the direct file, the PDF displays normally in each record. Is this a case with having to manipulate something within the PDF files themselves or is my thumbnail plugin acting up? I’ve never come across this issue so far, so I’m wondering if anyone else has and if they have any easy fixes.
Thank you all for your help!