Your Phone Saves H.265. The Browser Wants H.264.
The photos were easy. The videos nearly stopped the whole project. A video of my daughter would back up to the NAS perfectly, and then, when I tried to play it in the browser, I’d get sound but no picture. Or a black rectangle. Or, for the big ones, an endless spinner while it buffered. The file was fine. It just wouldn’t play. Two separate problems were hiding here, and it took me a while to see they were separate. ...