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Level 3

I'm assuming that you tried to optimize the PDF first and then merge it right ?

the other option could be convert to PS and then again PS to PDF, this also tends to repackage the PDF as per adobe standards at times.

If none of these work, try to open the 3rd party PDF in Acrobat and save it.

Now attempt the assembly.

if all options fail, can you host this file somewhere and share the link, so that i can give it a shot.

~Sidharth