Reading a PDF portfolio w Acrobat (free) reader

I am still able to create (and read) a pdf portfolio with my Adobe Acrobat Pro and the format appears the same even without Flash Player (left photo).

However, if I send it to someone that only has/uses Reader DC (or a free reader), all they see is the Flash logo (right photo).

Is there a way for Adobe to be able to read these? 

The 'publish and share PDF portfolios' helpx site (here) says to install Flash Player 10.1 or later even though the site was updated today; it doesn't mention Flash Player EOL. 

We're preparing a report where we'd like to continue using portfolios but will need the recipients to be able to read and review the documents within the portfolio when we're done. Being able to organize similar documents is important and need a solution that does not involve purchasing Pro software for them.

Is there another method I'm overlooking?

Thanks!