This problem is related to the storage place for the templates. The phrases you create are kept in the Roaming Settings that Microsoft provides for Office 365 accounts. And to our regret, we can't control it.
If you have a local Exchange server, then its settings may be causing this behavior.
Thus, regarding this problem, please turn to Microsoft support service for assistance.
Unfortunately, due to some storage issues in Outlook online the current version of the add-in stores all templates in plain text only.
No, since the templates are saved in different formats.
Sadly, due to some technical limitations on the side of Office 365 our add-on can't open the attachments.
When you click the attachment in the list, it opens the email that contains the file. You can open the attachment from that email in Outlook.