Please note that to list a file after you have chosen it with f, you need to use l to list one "page" at a time (more on that can be found in the debugger's help interface -- you will want to h to get the general overview of possible commands, and h l to get more help on l specifically; v might also be of use).

Caveat: I am not a debugger expert. I actually learned this earlier today when I read your post, and then started playing around in the debugger to replicate. But I knew other monks were much better at the debugger than I, and could explain the f portion of your difficulty, whereas I couldn't. I waited until I read good explanations of that part, but since no one else explained how to see the contents of the file, I thought I'd now share what I learned, one debugger-newb to another.