You can record your game screen using the Xbox Game Bar installed on Windows 10.
- After starting the game, press Windows Key + G to open the Xbox Game Bar.
- Select Record Now (●) to start recording, then select Stop Recording (■) to end the recording.
- You can also use the shortcut Windows Key + Alt + R to start/stop recording instantly.
You can find the recorded files in Windows Settings → Gaming → Captures.
Compress the video file into a *.zip file and attach it, or provide a URL where the video can be viewed.