If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I use only one featured image and no additional slideshow images in the portfolio.
Is it possible to make the next or previous button in the lightbox to preview the next or previous Portfolio Item ( images from the same category)?
No, unfortunately this is not easily possible. It would require some additional code which queries the next/previous entries, then fetches the featured images of these entries and then you need to write some code to output these images as hidden gallery otherwise the lightbox can’t display them as slideshow/gallery.
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