Can a Acrobat SDK plugin edit the fields of a PDF Portfolio?

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Is there a way to edit values in a PDF Portfolio?

I made a plugin for Adobe Acrobat Pro DC that adds a menu item and and does an action. Currently the plugin gets a page number from an open PDF Portfolio document and displays the page number in a popup window.  What I want to do is add that page number into a PDF Portfolio field for that PDF document.

I read through the Developing Plugins and Applications Guide in the Acrobat SDK library documentation page, but I didn't see anything about updating Adobe PDF Portfolios.  Is it possible to update the PDF Portfolio with a plugin?  If so, can someone point me to the right direction or to some examples?

Not sure if if helps, but I added an image of the PDF Portfolio.

Thanks!

[Test Screen Name]

It's certainly going to be possible in a plug-in, since the Cos layer gives access to everything. But I feel there is probably a layer or two that streamlines access. You will need to know, I suspect, the internal representation of a portfolio as defined by ISO 32000. A barrier is the term "portfolio" - invented by Adobe to describe something, but not the name used in ISO 32000. 

A portfolio is two things

- a collection of file attachments (which you can manage with PDFileAttachment APIs)

- a presentation layer added on top of this, which the specificaton calls "Collections" (12.3.5), and which have PDCollection APIs.

Is there a "replace this element PDF in the parent portfolio" API? Nothing that simple.

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Thanks for the reply.  I'll look into PDFileAttachment and PDCollection.  

I know I can add values to the PDF portfolio fields with javascript. Is there a way to integrate javacript into my plugin code? Or is that a whole can of worms that's not worth opening?