Citing photos, especially if they're not mine is really a task - even if they are Creative Commons (CC), like Pixabay, I try to link to the originator so they can get more traffic or tips.
I would love a drag and drop option with a pop-up prompting for a citation or link, but perhaps something that like would really require a whole platform change...and that may not go over too well with the users. But I'm not a dev either. Thankfully I know enough HTML and markdown to format my posts the way I like them....and I try very hard to keep the policy of DO THE RIGHT THING.