Thank you for your inquiry. I can’t seem to replicate the issue you’ve described here. It might be an issue with the file size limit you have on your config.inc.php file. I would suggest increasing this and giving the upload another try.
Public Knowledge Project Team
This issue occurred when I moved my site from a Webhosting provider to another one. When I got the backup and installed it on the new hosting account, I became unable to upload anything to the site. Therefore, I had to remove all the contents of my site and started it from scratch. I was lucky as the site was new so I was able to repeat it easily.