Copy & Paste Restriction (App Protection Policy) not working properly

I'm also having this behaviour. I can understand what Patrick is saying, and after testing, it appears that he is correct. 

However, there is still the odd behaviour of not being able to copy from Outlook to other policy managed apps, like Word.

Any ideas?

Edit: Nevermind! I understand now. So the document has to be saved within the corporate environment (OneDrive, SharePoint in our set-up) in order to be pasted into. So the "Paste in Apps" is a bit misleading, it must be within a corporate app and also in a "document" hosted in the corporate environment.