Troubleshooting a Twilio Video app requires identifying the problem, using tools like the Video Log Analyzer to gather data, and analyzing logs with the RTC Diagnostics SDK and Preflight API. Additionally, capturing information and storing it in real-time can help diagnose issues. It's essential to ensure that the user meets the bandwidth requirements for video calls and that the application can connect to Twilio's media and signaling servers. By using these tools and following best practices, developers can provide a better experience for their users and troubleshoot issues efficiently.