You must respect the view license. You continue to be responsible for the license and violations of it if you "hand over" things because you can't hand over a Stock license. It's hard to recommend Adobe Stock if you want something like a "community" to be responsible, because someone has to have signed a license (so they can be sued on a violation of it). A special arrangement with a photographer might be best, or work under a more open license.
Adobe provide no way to contact the original photographer, but you can check their profile in Adobe Stock to see if they give a contact, and you can also try Google Image Search.