ardour5 missing file dialog

Hi good people of ardour,

ardour 5.3.0 (I know I'm late) here. Import a file, not copying it to
the session dir., save and close. Rename the file, reopen the session
and ardour righteously complains about the missing file. But the dialog
window won't let me choose a replacement file.

I might overlook something bigger than me but I thought I'd just let
you know.

Thanks!

-- David