Why does not the link have a file name even though when I enter it my browser starts to download a file? [closed]

This is the link from an online video downloader website: https://dnd21232.9xbud.com/down/YToyOntzOjY6ImhlYWRlciI7YToxOntpOjA7czoxMjQ6IlJlZmVyZXI6IGh0dHBzOi8vd3d3LnRva3lvbW90aW9uLm5ldC92aWRlby8yMDY5NTg2LyVFNSU4MCU4QiVFNiU5MiVBRS0lRTclOEElQUMlRTMlODIlQjMlRTMlODIlQjklRTclQkUlOEUlRTUlQjAlOTElRTUlQTUlQjMiO31zOjM6InVybCI7czo1NjoiaHR0cHM6Ly93d3cudG9reW9tb3Rpb24ubmV0L3ZzcmMvaGQvODA4Y2YzYTk5MjZmOWE1NWMxZTciO30,/a0d2936fbe62772739c5a22515651f98-1630393072?customName=%E3%80%90%E5%80%8B%E6%92%AE%E3%80%91%E7%8A%AC%E3%82%B3%E3%82%B9%E7%BE%8E%E5%B0%91%E5%A5%B3%20-%20TOKYO%20Motion_%20HD It of course works when I want to download an online video, the Chrome can get an Mp4 file from it, but when I copy the address from Chrome and then paste it into a download manager it does'n get the file, I just curious about it, how does this type of link work?