X3Photo Gallery Forums

Yes, this is definitely possible, and there are several ways to achieve this. Will there be a LOT of text? Images? 

Tooltips
If there is not too much text, you could simply use tooltips similar to this page:
https://demo.photo.gallery/examples/var ... d-tooltip/

X3 Popup
If you have more text and perhaps images, you could use the X3 popup with "content". For an example, click the link below, scroll down to "Custom Content" and click "Click me" link.
https://demo.photo.gallery/examples/plugins/popup/


Modal
Optionally, you could also use the X3 modal plugin. Click link below and scroll down to "modal plugin".
https://demo.photo.gallery/examples/features/sample/

I would probably consider the X3 popup, but depends on the content.

Although there might be a way to fix it for scroll, the X3 popup is designed specifically for non-scrolling content, like full-size images or embedded videos or maps. Therefore, if your content may require scroll, I would have to suggest considering a different solution.

You have the MODAL option as I suggested in my previous reply, which supports scroll.