Problems with showing editable pdf files in the PDF Viewer

Although the pdf file that I upload to my journal is an editable pdf (OCR), something happens to the file when it is displayed in the OJS pdf viewer. Here it is neither editable nor can I make a search in it.

I have a very hard time figuring out the problem for some of my previously uploaded pdf files are displayed correctly. Do you have any experience with this problem?

We use the OJS
Niels Erik

I’m have same problem here… Don’t show or Download pdf for my aplication… I use 2.4.8