Only transcoded media will play

[evon3rd]

So, I now also remembered that there is the possibility of looking at the browser console.
After I click the media that I want to play, I keep getting these two error messages in Firefox/Chromium

Code:

HLS Error: Type: networkError Details: levelLoadTimeOut Fatal: true main.jellyfin.bundle.js:2:73451

Code:

HLS Error: Type: networkError Details: levelLoadTimeOut Fatal: false main.jellyfin.bundle.js:2:73451

Maybe that helps in finding the issue?

Thank you!