You can go to your Page in the
Pages section → Desired Page → Gear icon → Workflows
There you can choose, when to trigger the workflow to run (Page Load, App Load etc…), then based on the parameters, for each page you can fetch your images, and add them to an array, or whatever logic you use and then just display - bind them.
for the URL only, instead of download you can use the code @Alexis provided.
or if your bucket is public, you can construct the public URL yourself, without the need to do all this JS in the first place.