HI Eliot
I am not sure what you mean.
When I add a product, I am also able to attach a file to the product.
There is a setting in System -> Configuration -> Email tab called Embed attachments
When an order is placed and paid for then in the order confirmation email that is sent to the customer, a link to the file added to the product.
However, reading the help files it says the following:
Embed Attachments : Should HikaShop embed your attachments inside the emails? If not, HikaShop will add a list of attachments with a link to your website in order to download it.
If you disable this option, the send process will be much faster as HikaShop won't send the attachment but a simple link.
I have set the embed attachment to Yes but it still creates a link to the file rather than embedding it in the email.
thanks
Patrick