Auto-generate TOC entries that display heading names not file names

I'm using Robohelp 2019. When I import a Word file, I split docs based on heading 1, heading 2. I use the Word import settings to auto generate a TOC.  The TOC topic titles displayed are the file names, not the heading text. How do I automatically generate the heading text in the TOC headings?

I've attached a screen shot for clarity.

thank you