There are several different TOC formats that have been grafted onto the EPUB format over the years, and it is possible that Fastr Pro supports only some of them. See if there's an HTML toc, an NCX TOC, a spine, and a guide. Create any of those pieces if they are missing.
(Look around on the forum if you need tools for uncompressing and recompressing EPUB files; they're basically just ZIP files, with some rules about the order of the files, and a requirement that they not include a bunch of optional data like file permissions.)
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