Issues with dragging docs into Outlook messages

Hi

Several of our users are experiencing an issue when dragging pdfs and Excel files into Outlook messages. This worked fine until about 3 weeks ago. We are using Office 365 on the monthly update channel.

After pasting the file into Outlook if they try and open the file from Outlook they get the following message 'The operation failed. An object cannot be found.'. The document still opens from it's original location without any issues.

I've tried recreating the profile and that seemed to resolve the issue for a day or 2 but then returned.

Thanks