- Include Attachments does not appear in PC Outlook Add-in for some users
- Outlook Desktop
When selecting to "File" an email in Outlook Desktop, the modal to the right doesn't include the ability to "Include Attachments". However, with the same Outlook account, they are able to see this option when viewing the email in Outlook 365 Online.
Not yet diagnosed
Install the web version of the Outlook Add-In and file the email with attachments there.