I had this problem where if I uploaded PDFs to WordPress, the PDF would become a blank document or display as blank. It wasn’t a lag problem which can sometimes happen too. I’m not sure what the problem was, but I did notice that the PDF set to ‘not editable’. Setting the PDF to editable fix the problem.
Make PDF editable
- Open PDF in Adobe Acrobat Pro.
- Click the round blue ‘i’ button at the top left of the page.
- Click the ‘Enable Editing’ button.
- Save the document.
This new editable version should display properly online.