Alternate and Mix PDFs
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Combine a file of fronts with a file of backs. The pages are interleaved one at a time.
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A scanner without a duplex feeder gives you two files: every front in order, then every back. Read separately they are useless, and merging them end to end puts all the fronts first and all the backs last.
Interleaving takes one page from each file in turn, which is the order the original document was in. The result is the document as it was on paper.
If the result comes out with pages in the wrong order, the reverse setting is almost always the reason. Try it the other way before assuming the scan is at fault.
Because of how the paper is handled. The fronts scan as 1, 3, 5, 7; the stack is then flipped and fed again, so the backs come out as 8, 6, 4, 2. Ticking the reverse box puts them back in order.
That is allowed. The pages interleave for as long as both files have one, and the longer document simply runs on at the end rather than being truncated.
No. Merging puts one document after the other. This takes one page from each file in turn, which is what a two-pass scan needs.
The finished document is capped at 500 pages across both files.
Files may be processed in memory or temporary storage depending on the operation and are not intentionally retained as permanent customer document storage.