Hello @daniebester,
As discussed in the thread you have mentioned,we have a rtMedia Favorites addon - https://rtmedia.io/products/rtmedia-favorites/ which can help to create a list of favorite media.
If you want to display a media gallery created by Admin then you can use rtMedia WordPress Sitewide Gallery - https://rtmedia.io/products/rtmedia-wordpress-sitewide-gallery/
Let us know if the above addon can be of your help or you have any doubts so that we can assist you further.
Thank you.