As unreasonable as JimLL is, he is pointing out something that needs fixing. Trying to save a file that is html should give you a message: Sigil does not save HTML. Would you like your document saved as an EPUB?
And if the answer is yes, save it as an EPUB
It has been a long time since I went through this, but I remember how puzzling it was.
As for complaining about something that is free, aimed at pros and semi-pros and that no one is forcing you to use, that is an entirely different issue.
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