For those who are interested, the documentation is found at
kobolabs: epub-spec.
The relevant portion for renamed to kepub.epub ebooks reads:
Quote:
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Sideloaded EPUBs with the ".fxl.kepub.epub" or ".kepub.epub" will disable bookmarking and note keeping. Thumbnails for covers may not display. Otherwise the reading experience and content display will be identical to how the file would display when loaded through the store. Leaving the extension as ".epub" will enable bookmarking and note keeping and will trigger the ADE display engine.
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