Unfortunately, you cannot include attachments in any email sent using VerticalResponse. Attachments clog bandwidth and your recipient's inbox, and if included in bulk email the chance increases that your email will be flagged as spam or blocked entirely. Information you wish to convey to your contacts should be contained in the body of your email or through a link back to your site (a great way to drive traffic back to your website!)
If you have a document or other file, we recommend that you host your content online and include a link as part of your message. Your recipients can click and download your document directly from your email, and you can get some reporting about which of your recipients are most interested in what you have to offer.