Direct answer
Manual Entry is the stable fallback when a site blocks fetching. Open the chapter in your browser, copy the readable story text, paste it into FanFicBinder with a clear chapter title, and continue the binder normally.
Why this fallback matters
It preserves the rest of the workflow. You still get chapter ordering, title and author metadata, optional cover images, EPUB export, and Reader Mode HTML export. Only the chapter ingestion step changes.
What to keep consistent
Use a clean chapter title and paste only the story text you want in the final file. That keeps the binder easier to navigate after export.