The scorebug is drawn straight onto the recording. Camera needs a secure connection (https, or open this file directly on your device) and your permission — if it's blocked in a preview window, download the file and open it in a browser.

About YouTube: a browser page can't push a true RTMP live stream to YouTube on its own — there's no server here to relay it. "Upload to YouTube" opens YouTube's upload page so you can post the downloaded clip after recording. For an actual live broadcast, use free software like OBS Studio: point it at your YouTube stream key and either capture this window or your camera directly — it'll carry the same overlay if you share this browser tab.