Most manga translators accept images, ZIP or CBZ. EPUB is rarer: the page images sit inside the book container and are referenced from its package file, so image-only pipelines cannot touch them. MangaOCR accepts comic EPUB uploads and returns the book with the translated page images in place.
Your EPUB is returned with the translated page images substituted inside the book. Only the page images are replaced; the rest of the file is left as it was, so your reader still opens it the same way.
In an EPUB, the reading order is defined by the book's package file, not by the order or the names of the images stored inside it. The in-browser preview lists the translated pages differently, so they can look out of order there. This affects the preview only — the exported EPUB keeps the book's original reading order. To check the result the way a reader will see it, download the file and open it in your e-reader.
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