Morning. I’ve tested this and it doesn’t seem to be working? After other comments here (thank you everyone) I realised I could be much cleverer with this. Following advice in another post (New user questions: In or From DT - #8 by BLUEFROG), I set up an Alias for the DT Inbox and put that on my desktop. In Apple Mail I exported an email to PDF and saved it straight to the DT Inbox. This bit all works as expected.
However, the new PDF email in DT has not got OCR - I cannot search for text that appears in the email. Any idea why that might be, as I think from the comments Apple should have done the OCR step?