How to attach a file at the end of the presentation

Hi everybody!

I'm trying to attach a pdf at the end of the presentation.
I'm able to insert a file or a link using the "Path" method, but in this way the attached file will always be available for the download. That's not what I want!
I want the user to clic on a button inside the last slide at the end of the presentation, not before.

I tried hyperlink or insert>action>insert a file, but surely I made some mistakes.

Can you help me?

Thanks in advance

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