Import specific mail across multiple mailboxes

When I’m using an iOS device and come across a mail I would like to later import to DT, I flag it. I had hoped that on the Mac DT3 would be able to import all flagged mail. Whilst I can define flagged as a filter criterium, there is no way to import all flagged mail regardless of which mail folder I have put it in. Instead I would have to click my way through each folder (or leave the mail in the inbox until I had had time to import it). Or have I missed something? As far as I can tell, using smart mailboxes is not an alternative, because they are not available for import. Is that correct?

This is correct and isn’t possible right now. One alternative might be to move the email to a dedicated mailbox (assuming it’s an IMAP account) and to import stuff from this mailbox on the Mac.