FINALLY! Thank you for the help. I wish I had asked sooner. I see now that when I was doing the last step of changing the Insert Behavior, I was choosing the wrong thing which changed the wrong code. And then I was focusing on the wrong code to try to figure out what was wrong. I'm making notes so I won't struggle with this again.
btw - it does work with a blog but I like the text field better because I can actually see the name of the file now.