We work so hard and long to make presentations and it is a shame that we can not recover a file that was deleted by accident. Please do something to help teacher get these file. I know in google there is a back arrow when I make a mistake. I know if I delete a picture when I am making a presentation there is no way of going back to get that slide. It takes hours to come up with great presentation and it really hurts not to be able to get a file you spent days on back due to one error. I was trying to make a copy and hit the delete and now my days of work is gone and I am not prepared for class today.