Can I send attachments with my email campaigns?

Unfortunately not.

The reasons for this are:

  1. Avoid viruses sent with attachments.
  2. Increase the speed of sending your campaigns.
  3. Increase deliverability.

There is super simple workaround to let your readers download your file. You can host the file on your server and put a link to download it or you can use outside file hosting service like Dropbox.