When trying to attach a file located in File Bridge using Outlook 2016 from New Email -> Attachment File, a hyperlink to the file is created and is embedded as a link in the instead of the traditional attachment.
Cause:
This is caused because MS Outlook 2016 sending attachments as links by default if they are stored in network-accessible locations.
The custom "Attach File" is on the right in the image above, and does not have a drop-down list. This is the one you should use.