If you want to send an message to your Shareholders through Cake with an attachment, you can do this by adding the link to your Google Document (saved on your G-Drive and shared publicly) in the announcement.
Go to Communication in the main menu and select 'Messages'
Select New Message
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)
Select the link symbol and add the URL for the Google document you would like to share.
Choose the text you would like to be displayed ad select Add
Keep in mind, messages can only be received in the Cake platform, but a notification will be sent to your recipients.
The ability to attach Cake docs to a message is coming soon. View our roadmap here.