A minimal example
example.odp (application/vnd.oasis.opendocument.presentation), 223.72 KB, created by tk on 2019-06-18 18:32:10 UTC
(hide)
 
Creator: tk
Created: 2019-06-18 18:32:10 UTC
Size: 223.72 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.oasis.opendocument.presentation) is not one that your browser is able to display.

Download the attachment.

Actions: View
Attachments on bug 125996: 152278