Increase your website’s upload max filesize limit on your server by adding rules to php5.ini. If a php5.ini file does not exist on your server in the root of your website, one will be created. If your server uses php.ini instead, go to Tools -> Upload Max Filesize to run it with php.ini. You can also use this plugin to see your current php.ini settings status (go to Tools -> Upload Max Filesize).
Get the plugin free at WordPress.org. Support is also available, there.
Fork it on GitHub.