I have a question about deleting files on my Bookport. I have a couple of books I have read but do not care to keep. I am reading another book, and do not wish to lose my place. If I navigate to the files I wish to delete and delete them, will Bookport put me back in my place in the book I am reading or should I wait until I am finished this book and then delete the files before beginning another book? Thanks. Marilee