Not much, trouble that is. The way I set up the user, all the account can do is view photos and remove them from the shared folder to which access is granted.I'll try setting up a user with limited access to photos on my Synology and see what kind of trouble I can cause.
My efforts to get a "public sharing link" in both the administrator account and the limited account I set up tonight worked, but the link didn't. It's supposed to pass through the Synology QuickConnect service, and looks from the link's text as it is conformed to do so, but it strikes out.
My experience with Synology documentation is there's often "one little thing" missing that clears up issues. Often a click or setting that's not in the immediate area of the "management tree" I'm in. Sometimes I find them in blogs, others in the many helpful videos on YouTube. Haven't found this one.