Hello, thanks for your purchase.
Do not worry we are here to help!
For contact forms with attachments you should use the “contact-us-advanced.php” for your contact page. As this is a PHP file, you need a local or online server with PHP. For a local server we recommend XAMPP:
https://www.apachefriends.org/download.html
XAMPP is a software to install a local server with PHP in your machine. Once you have XAMPP installed, just extract the template files inside a folder like:
C:/xampp/htdocs/porto-template/
Run XAMPP and start the apache server. Open the project in a browser using this URL:
http://localhost/porto-template/
This way you will be able to run PHP files.
Important: To get the contact form fully working you, I mean sending the contacts to your mail inbox, you should upload the website files to a online server.
We hope this helps and clarify!
Please try that and let us know if you need further assistance.
Kind Regards,
Rodrigo.
If you are satisfied with Porto HTML and our support, please leave your comment and rating on ThemeForest downloads page. That helps us a lot: https://themeforest.net/downloads