Author cannot upload their paper to ojs

Hi, i need a help. I got a complaint from authors that they are unable to upload their paper via ojs. Then the screen showed not found. How to fix the problem?

Hi @MYTRIBOS_Malaysia,

What version of OJS are you using? It’s probably an issue with file permissions; see the FAQ for more information on how these should be set.

Alec Smecher
Public Knowledge Project Team

How to set the file permission?