IMPORTANT: This guide applies only to websites hosted on our Legacy (pre-2015) Flash-based system. Click here to view articles for our current platform.
Yes, people can add images to an existing Lightbox link they received if they add images from your website portfolios to it (they can only add images that are visible on your publicly viewable website).
This will generate a new URL to the modified Lightbox which they can then send back to you or send to other people. Each time the Lightbox is modified and sent from the front end website, a new URL is created.
This, however, does not affect your original Lightbox. This means there may be multiple versions of your original Lightbox.