This article applies to 123-reg servers running Plesk.
By default PHP is configured to upload files upto 2MB in size, this will give you an error message if you are trying to upload larger files. If you need to upload larger files this limit can be increased by editing the following values in the file /etc/php.ini:
You will then need to restart Apache.
Please note: The value for post_max_size must be greater than the value for upload_max_filesize
The value for memory_limit must be greater than the value for post_max_size