The website might have strict privacy or security settings that prevent Paper from accessing the media.

Many websites implement anti-bot or anti-scraper measures that can block or limit requests from services like Paper, especially if those services don't have the right credentials or if their requests are not properly rate-limited.

If the video is highly protected or the tools simply won't work, the failsafe method is to use a screen recorder (OBS Studio, Windows Game Bar, or the built-in screen recorder on your phone).