Adding an attachment from OneDrive to a message in Outlook for Mac

To attach files from your OneDrive account when composing emails in Outlook 2016 for Mac you first need to sync your OneDrive data to your Mac using the OneDrive app.

Once you've done that:

1. Compose an email and click on the Attach button.
2. Browse to find your OneDrive folder and attach the file as you would a local file.