I think the OP wanted the extra spans, etc. that are part of a kepub to be added. The simple rename to kepub.epub is useful for testing by an author but screws up highlighting, note taking and some issues related to cover display.
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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