I need an answer to this problem as well. It seems ridiculous there isn't some sort of file manager to access all your files.
I have some files that I've already uploaded and since then I have uploaded another 20 files. Now I'm trying to create hyperlinks to the ones uploaded earlier and I can't access them from the list, because it only shows 20 files.
I could re-upload them but what is the point of duplicating work like this?