Yes, I had a pdf created from Affinity Publisher, so I tried a variety of pdf to doc converters to get the best word file I could come up with to import into calibre. None of which worked very well. I ended up converting the pdf to html (TalkHelper PDF Converter) and have been working from that, manually editing the html.  Ideally, I suppose, you would use the text file or doc you imported into Publisher, but I made changes after laying it out in AP, so I couldn't use that original tex