Merging two documents produces unexpected output

Question

I have two PDFs of each 2 pages. When I merge them I get a document of 4 pages - but the first document twice and the second document ignored. Or otherwise put:

I merge document A with pages 1 + 2 and document B with pages 1+2 and expecte A1A2B1B2 but get A1A2A1A2

The document A and B are two PDF Forms, where I can enter Information.

If I print (adobePDF print) those document first and then merge them, I get the expected result. So I can workaround the issue, but there is no warning whatsoever that the produced document in the first place is not the expected result!

I use Version 2015.006.30527 Adobe Acrobat Pro DC

PhoenixSPH927 · Answer

As my software is a bit dated, but I don't think obsolete, I tried it with the 2020 edition.

This version kindly tells me, that the documents are forms and any identicall field names will overwrite each other. To prevent that, I should consider creating a portfolio.

To cut the chase short, in a portfolio I get the expected result - either in the 2020 or 2015 edition.

It yet evades me, why it is not possible to give each document its own namespace when merging them, as a portfolio is slightly not the same as a single document.

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