While there is no way to send file attachments with your email campaigns (they can cause issues with anti-virus software and spam filters, among other things), you can link directly to files.
You can either host files on your own website and add the link to your campaign, or upload a file to your CakeMail Image Library.
To upload a file to your library:
Under the Library tab, click on upload to upload a new file to your Files folder.
To link to the file within your campaign:
Click on the link button in the section you wish to include your file with. Click Browse Server and select the file you uploaded to your library previously.
The file is now linked from within the email. Recipients can access it by clicking on the link.