Attachments in Email Broadcasts via LDS.org

Is there a way to include an attachment in e-mail broadcasts via lds.org? We can't seem to figure out how.

No. All e-mail through the LUWS is text only without attachments. Some people recommend creating a "News and Information" item with an attachment. The LUWS broadcast message can then refer to the news and information item attachment. There are size limits to news and information item attachments however.