Thanks for that Mike. Yes, my first unsuccesful attempt was by using the import function in the File menu. Thanks for letting me know about double clicking instead. That worked although I had to change default notebook first. And yes, I hope the ability to edit dates is re-introduced.
Ideally I wouldn't have to edit dates. Legacy Evernote does not change the update date if I add a reminder to an existing note, move to a different notebook and possibly (I can't remember) add or amend tags.