In this video I cover some of the issues with using Starlink as an ISP for uploading to Twitch TV ingest servers.
Some of the apps I used for diagnosing were as follows, but I’m not endorsed by any of them so use at your own risk.
-Twitch Inspector (in browser service)
-TwitchTest (desktop app)
-Various unnamed masking services
-Numerous google searches involving Starlink, Masking services, Twitch, Netflix, and Upload advice.