First, crate the form using CSS Form Builder, do not set anything on the form functions tab, we will add that manually.
after the form is created go to Webassist - Create Email Message.
set the To Address option to use the email address element from your form, if you want to include the form information in the confirmation email, select the Create a File For the email option, and select one of the tempaltes.
Repeat this process again to add a second Create Email Message behavior, this time set the To address to go to the site administrator. select the Create a File For the email option, and select one of the templates. and set the Go to page to redirect to a confirmation page.
No go to the attachments section, add an attachment for each file field, use the Submitted file option and select the file field form the list.