The app uses your local file system and browser - so nothing to install or upload. Click the Choose Files button and select all the mp4 video files within a directory and the app will play the videos from the left, front, and right cameras simultaneously on the screen. Click the speed button to cycle through 1x, 3x or 10x speeds. Will play all the one-minute videos in order by timestamp in the filename.
Let me know any thoughts if this is useful or ideas to make it better. It would be nice if this would just work from the Tesla browser in the car and have access to the files directly mounted from the USB TeslaCam directory.