Merge tag to display just the file name of uploaded file

I’ve searched but haven’t found the answer to my exact question. I have a hidden field that I would like to hold just the file name of an uploaded file. Using just {:73} works to get the whole URL, but I need to prepend and append text to just the file name.

Is there a way to just get the file name by itself? I need to preserve the file name, but change the link structure.