Adding Image Caption to Lightbox Viewer

I hope somebody will reply to this thread – it seems most support threads are ignored on here these days 🙁

I have seen that in the last update the following was added:

Added: lightbox captions for slider, carousel and custom_gallery. Commit by Valentino Pistis

Well I have added a Slider linking to a Lightbox to my site and I cannot see the Captions that I have entered for my images anywhere. All I can display, either never, on hover or always, are the image titles as before. I don’t spot any reference to the captions in the source code being output either.

Can someone point me in the right direction please?

Thanks in advance.

https://ww.wp.xz.cn/plugins/shortcodes-ultimate/