I seem to have encountered a bug with my project or lightbox.
It seems similar (but not the same) as this thread Lightbox settings doesn't work
I’m building a jewellery brochure site, with lots of pieces displayed in a grid, with a larger image of each piece opening in a lightbox. So far, I have created about 30 lightboxes, but now I am unable to add the image for the Media field. ( I can change the thumbnail image). Instead I’m left with the default image-placeholder.svg