"Shot on OnePlus" is an initiative by which users can upload their shots via a smartphone app or online. This is done via an API, which, when analyzed, was found to be a ready source of user emails and IDs. The company's response to this situation currently includes an overhaul of this interface.
https://www.notebookcheck.net/OnePlus-found-to-have-a-user-data-leak-through-photography-app.424008.0.html