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Is the OP not putting them in the Sigil Images folder, and trying to force an organization of his own? Sigil is good at what it does, but it does it its own way with its own structure. If you want free form structure you'd have to go with the calibre editor or another editor. I'm suspecting you can create any other folders you want, but the files will be deleted or moved to some folder like Misc on saving.
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