At this moment we don't allow the sharing of files in emails. Email providers see attachments in marketing emails as malicious and will AUTOMATICALLY put them in SPAM or block the email.
We recommend uploading it to a hosting site, such as google drive or dropbox, and creating a shareable link that you can add into the email for the file. Does this make sense?
Here is how to do it on Google Drive: Share link
Here is how to do it on DropBox: Share link