Publishing to Responsive HTML does not use the file name as the topic name

I have tried multiple things to get the file name to appear as the topic name in the TOC. My single file (in a book) is generated as a book file with an href that uses the correct URL but the topic lists the title of something in the doc. I thought at first that the conversion was picking up Title from the File Info, so I deleted that from each file and tried again. Still getting the title as the href - not the file name. Using <$filename_no_ext> as the Topic Pattern Name has no effect. Changing the HTML Mapping Macros to use <$filename_no_ext> instead of <$defaulttitle> has no effect either. Any suggestions? If I can get this to work then I can convert all of my docs to HTML.

Thanks