So how might we get a lightbox with GUI editor for a photo that does not have a caption? The following image was inserted without caption and with Link To set to none, then changed to Link To setting to Media File. No lightbox, which makes sense since there is no shortcode.
Next, I’m trying the same approach, but with manual insertion of class=”themeblvd-lightbox mfp-image”. (See: https://docs.themeblvd.com/article/26-lightbox-integration) This does produce a clickable lightbox, but lacks the visual lightbox indicator on hover. The title attribute of the tag shows as a caption in the lightbox.