HTTP ERROR OJS 3.3.-7 file upload

Describe the issue or problem
Uploading an article.pdf during revision stage or as final publishing gives this error on the uploading box for the document.

Steps I took leading up to the issue
For example:

  1. Tried different documents and have the same error

What application are you using?
OJS 3.3.0-7

Additional information


You’ll need to talk to your system administrator and have them look in your server logs for the PHP error being reported here.