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When you send the message to your collaborator, your collaborator will see your message on their activity stream page.
Import Options
You can import upload files into the message box using different options.
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My computer, you can use to import files from your computer into emakinEmakin.
Camera, you can take a photo using your computer camera and attach this photo into the message box.
Google drive, you can use to import files from your google drive account into emakin.
One drive, you can use to import files from your one drive account into emakin.
Office 365, you can use to import files from your office 365 account into emakin.