I have done this recently and the zip file had the images names as "index-n_1". The "n" was the index number of the book to set the order. What happens with that will depend on what you use to read it. Windows will usually treat that as a number and get the order correct. Other applications might treat it as string and hence sort "index-1_1" then "index-10_1". To prevent any issues, I renamed the files to pad with zeros on the left so that all the index numbers were the same length.
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