Hi guys, i have the same problem too, i have as per required PHP version and latest OJS installed on June 2022. I cannot upload files during submission and review.
My solution
Open your hosting Cpanel > File Manager and look at your files folder location URL and make sure it is the same with the one on config.php
before the error mine was /home/files but when looking at the files location is supposed to be /home/bioenvui/files
hope it can helps you guys
cheers