MC6MkII 3.9.5 Beta editor Chrome app. Windows.
I backed up all Banks to JSON.
Manually edited JSON in VSCode (simple job: copy Exp2 from bank 1 to bank 24).
Uploaded to controller - prompted that file had been manually edited.
Clicked proceed at your own risk
Waited ages and didn’t move away from the “page” - didn’t see the usual Good To Go modal until I moved mouse over Choose File button.