The ability to review all old versions and delete or replace a version.
Use case: I'd previously uploaded V1 of an artboard. I uploaded V2 change to an artboard, but upon reviewing in Sympli, I realized I forgot to use the correct type style or a color was off, or maybe I realized things were grouped that didn't need to be. I want to replace V2 with a new V2, OR upload a V3 and hide/remove V2. This way all of my revisions to all artboards will be on the same version.