It is not possible to send an attachment to a list via email marketing in Online Express. However, a link to the attachment made available can be included in your Online Express email blast:
  1. Upload the attachment to your website, or provide the attachment to your webmaster to do so. Test the link/file path to the attachment by opening it directly in a web browser to make sure the document is "public" and not behind an intranet / internal web environment. (NOTE: Please contact the appropriate software vendor or IT professional for assistance with this process or issue which is beyond Blackbaud's scope of support.)
  2. Insert the link/file path to the attachment in your Online Express email blast. For more information on designing emails, please refer to this Youtube video on Online Express email design.