Not able to upload PDF by using any browser

Today I’ve been trying to upload a PDF to get it analysed, but without any success. I tried to upload other PDF, but still, it doesn’t work.
Then I’ve cleared the cookies, I tried with other browsers, but still I’m not able to upload the PDF.

Any suggestion?

I have had the same problem since yesterday: I can not upload any PDFs

Now it’s working again. I had in the first place an error saying it was not able to read the content of the PDF, then I’ve created a new case uploaded the same files and it worked.