There is no such draft outlook email action in desktop flow.
My current solution is send out email once (To my email address) -> Retrieve email in 'Sent Items' -> Save outlook email messages (.msg)
However, it still need manual steps to update recipients (update to correct/real recipients).
Is there any solution that do not sent out email instead of keep it in 'Drafts'.
Like:
Draft email -> Retrieve email in 'Drafts' -> Save outlook email messages (.msg)