Selecting a OneDrive or SharePoint file, however, provides you with additional permission options and information. If you selected a file on your local computer or group document library, a copy of the file is attached to the email.

Opens a File Explorer window where you can choose a file from your computer. Select one of the locations to open a new window and then select your attachment. Locations include OneDrive, SharePoint sites, or other locations such as a groups document library that you've accessed before. Select a file to attach it to your email. These files may be on your computer, on OneDrive, SharePoint, or another online document library.

The 12 most recent files you've worked on will be displayed here. Select your file from one of the following locations: In a new message, a reply, or a forwarded message, select Attach File from the Message ribbon or the Insert ribbon. See Blocked attachments in Outlook for the complete list. Some file types are blocked from being sent or received. Outlook keeps track of the files you have worked on recently and suggests them whenever you decide you want to attach a file to an email message.