If you do not want to create an account it means they are shared publicly, or you can password protect them. But if you want to add more to the mix, then this idea sounds like a nightmare for any server admin. Imagine bots adding lots of messedup photos to your server, constantly.

Thus you either need a file sharing without account solution, like send.trom.tf/ - you add the photos/files, you put a password if you want, you share. Or by far the best is Nextcloud. files.trom.tf/ - create a quick account and add your photos, then add more, then share as you wish. If you need more storage space let me know. We extend it for those who want. All is free of course.