I love using this app on my iPad. It’s very convenient to use when editing or annotating pdfs, especially for school or college. Just some suggestions: When undoing or redoing a line stroke, please have us undo or redo a single stroke instead the entire word(s). I have pictures describing what I’m taking about for the undo and redo function below. Also, add a selection tool for the stylus for us to draw where we want to select and move a stroke.