Issues converting certified multiple PDF's into single PDF using PDF portfolio

Any advice on using PDF portfolio to convert multiple single certified PDF's into single PDF portfolio?

I have been doing this successfully for years, and over past 6 months with new Imac and Macbook Air, I cannot perform this simple function.

Cant tell if account is corrupted or settings are incorrect.

Any help is appreciated.

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Adobe Expert

What exactly happens when you attempt to do it?

New Participant

it basically says the files I am trying to convert cannot be done, see below

Adobe Expert

Are you sure you have the Portfolio option selected? Check the Options dialog in that window.

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