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I have attached a portfolio file.
However, when opening with Adobe Acrobat Reader DC,
the last file in this cannot be opened.
The rest of the files can be opened normally.
Please help me check this problem.
That's weird. The same happens in Acrobat DC. It seems to be a bug, since you ca open the last files when you deleted all other files from the portfolio. Please use the official way, to report this as a bug: https://acrobat.uservoice.com/forums/590923-acrobat-for-windows-and-mac