PHP expert for an extremely minor fix in a plugin

Official WordPress SES plugin does not support sending attachments.
I would like you to please take the code from the official plugin site and make fix it so it supports sending attachments (PDF , DOCX , DOC) .

We will check it through CF7.

Official plugin could be downloaded from here - https://wordpress.org/plugins/wp-ses/

ses.class.php could be found here - https://github.com/daniel-zahariev/php-aws-ses

Test would be done on our servers.
All neeed is to add the addattachment code to the wp-ses.php file.

Thanks,
Dan