I ended up going on a paid plan for storing other kinds of files (video mostly). You still get unlimited photos as long as you have your prime subscription, so it doesn’t count towards your quota on the paid side. I figure that’s their M.O. - lure you in with unlimited photos because it costs them next to nothing to store photos and then when they want to store other kinds of files it’s less friction to just get a paid plan. Seems to be the same strategy going with prime video because it is also included with prime but I have subscribed to a few channels on top of that so they get money from me that way.