When uploading a long PDF, then you go to read it but get halfway through, when next you load it, you have to scroll from the beginning again. If we could bookmark our current place in that file and return to it, or create bookmarks we could jump to such as those colored arrow stickers you can add to a book (doesn't have to be as fancy as that obviously). I am reluctant to upload a several hundred page PDF I have because of the massive scrolling to get anywhere within it.