Saving past edits/versions like Google Drive does.

Recently, things I wrote in GoodNotes have randomly disappeared, and they would only sometimes reappear. It's fine if they disappear when I know exactly what I wrote, but if it's something I copied from another part of a document or from another document altogether, and it randomly disappears, then it becomes a problem. A possible solution would be the ability to access past versions (like Google Drive) to retrieve what I copied/cut.