I don't quite follow what you mean by "along with the toc.ncx and content.opf file". You can certainly open/import an html file in Sigil, but it won't "bring along" any ncx or opf file with it. You then Save it as an ePub file and then upload that epub file.
Perhaps you're under the impression that you're simply editing the original html file (and the ncx/opf) with Sigil and saving them again to be used in something else?
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