You can now add attachments to your Shareholders through the built-in Communications feature in Cake.
Go to Communication in the main menu
Select + New Message at the top-right corner.
Select your starting template (Blank or use an investor announcement like 'The good, the and the ugly')
Add a subject
Choose recipient (this can be a single shareholder or a group)
Click Attach file. You can attach doc, image, pdf, or xls files.
Keep in mind, messages can only be received in the Cake platform, but a notification will be sent to your recipients.