The webpage was literally just the Disney+ website I've been on several other times on the computer. The exact page I started off on when I went to bed was https://www.disneyplus.com/video/c71...6-ba2d20d2ebe4 and when I woke up and saw the save/open file prompt it was on https://www.disneyplus.com/series/ph...b/1Vl0AKTYhC6U which is just the generic details page for Phineas & Ferb that shows up after you've been idle for too long.