Saving numbered versions

Hello: I am new, so maybe I just haven’t found it yet, but I would like to be able to save a version number automatically, rather than saving a copy. Easier to sort through to see the one I am looking for. On a Mac.

Also, I am not seeing an “undo” button? I am coming to Vectornator from Freehand and Illustrator, and it seems to me that they had buttons for quick undo and redo.