What you describe you need is already the case.
Each image will already have a unique URI - how else could your (openseadragon?) plugin find and render the image?
is located at:
Those images are already there and just being referenced under the hood of the js driving the plugin.
If you cannot locate the images in your hosting side resources then you can always use the network panel in the browser inspector to ascertain the URI being referenced for each image.. that tells you where you can locate them.