Problem with transfer of emails from Mail after upgrade to DT3.8

I’ve just updated to 3.8 and when I went to make my weekly transfer of emails from Mail using the Transfer to Devonthink 3 drop down option in Message it had disappeared. I’ve checked the Install Add-ons in DT3 and it shows that the Apple Mail plugin is installed. Any ideas for a solution?

Did you enable the plug-in in Mail’s preferences?

Agh! I knew that there must be a simple solution! That’s worked! Thanks very much!