If you don't have installed program for editing PDF documents on your computer, then you can use web application PDFescape which allows you to edit your documents in your browser.
If any file can not be deleted, then you can use the program LockHunter, which removes the active connections of other applications to that file, which allow you to change or delete file.
If you dont't want that every time you take a picture with your Android device, it gets instantly uploaded to your Google+ profile, this tutorial's for you.