I'm attempting to install C5 on a client's server - Network Solutions VPS - and I'm receiving the following error message when I attempt to upload files via the File Manager:

"Unable to copy file to storage directory. Please check permissions on your upload directory and ensure they can be written to by your web server."

I've made sure my directories are writable, and I've edited the upload_tmp_dir directory setting in the PHP.ini file to explicitly point to /tmp (chmod 777), but no luck. I've scoured the forums, but my problem persists. Any help, or a nudge in the right direction would be greatly appreciated.

Thanks!