I opened a file and modified the contents, then selected duplicate meaning to save the duplicate as a new file. I closed the original, expecting rekect the prompt to save changes... instead it closed the file with my changes without any prompting at all. My original file is apparently just gone.
Unless I have found a bug (unlikely) I must be misunderstanding how duplicate functions. In lieu of save-as (from Windows world) what is the correct way to achieve the same thing without risking loss of data?