You use Microsoft Outlook 2016 for Mac or Outlook for Mac 2011 to connect to a mailbox on a Microsoft Exchange server. When you send an email message that contains a large attachment, you receive the following error messages in Outlook for Mac. Attachments exist in GMAIL web interface but not in recent emails on Outlook for Mac. Source As apparent from the above comments, users facing this issue are unable to view their attachments at all via the Outlook app for Mac.
View Attachments in Outlook 2016 for Mac
You can see a preview of your message attachments right in Outlook 2016 for Mac, instead of opening each attachment in a separate application. Attachment previews are available for many file types, such as Microsoft Office documents, photos, and PDF files. You can see each page of a multi-page document, and see a collection of photo attachments as a slide show.
Open the message or view it in the reading pane.
Outlook For Mac Attachments Warning Email
Next to the list of attachments, click Preview or Preview All .
The first attachment is displayed in the preview window.
Use the controls at the top of the preview window to view the attachments. Options include opening the preview window in full screen, skipping to the next attachment, viewing all attached documents, and opening the document.
Outlook File Attachment Settings
For more options, click Open with Preview at the top of the window, and use the controls at the top of the new preview window to interact with the attachments.
Microsoft Outlook For Mac
To preview just one attachment in a message where there are multiple attachments, select the attachment, and then press SPACE or click the down arrow and choose Preview, Open, Save As..., or Remove.