DLP Email Attachment Not Being Blocked

I made a case with Sophos on this-

The recommendation is to-

This is a known issue and it is because when a file is dragged into an email in Outlook 2013, it does not get dragged from the original location, it gets moved via a TEMP location and it is this TEMP location that triggers the file transfer action.

The default TEMP location is:

C:\Users\[USER]\AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\<STRING>\

By default, this folder is an excluded location so any files transferred from here will not be detected by Data control.

Please see this article below in order to resolved this issue:

-----------------------------------------
Article ID: 122603
Title: Outlook 2013 - Data Control does not detect the copying of files to an email
URL: https://sophos.com/kb/122603
-----------------------------------------

The KB above is for Outlook 2013 but it applies to 2016, the path is different

Office 2013 - HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security

Office 2016 - HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security

However, this does not work with Office 365, I made the appropriate changes to the registry.  Reopened Outlook and dragged an attachment over that would set off DLP, nothing happens.  Upon further examination with procmon I was able to determine that Outlook will change the registry back to- 

C:\Users\[USER]\AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\<STRING>\

This happens when a item is dragged over to the new email, basically Outlook does a registry check for the correct string prior to adding the attachment.  What I want to know is it possible to give Sophos permission to scan the-

C:\Users\[USER]\AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\<STRING>\

Any help on this would be great!

Anyone??? Bueller?  Bueller???????

Anyone??? Bueller?  Bueller???????