I have ebooks that require me to add my own notes to them; & three times I have written extensive notes using the fill & sign. Out of the blue, not even sure what or how it happened, I lost my individual notes I was working on. I wish there is a way we can 'Undelete' a delete without having to start all over again. Yes, it's to be saved, but when I'm on a note, without any indication, or accident of doing something (?), there should be a way to pull that deleted note back. It happened three times to me & I was very frustrated because of it. I'm going back & forth listen to a video & taking notes in the ebook (workbook). Please develop something that can help for ebooks (workbooks) that we have to write intensive notes without fearing to lose ur notes.