directory to save

When the button"Stop" is clicked, where is the location the recorded file is saved ?
Actually I don't think any video is saved. There is no video file newly found in my phone.

Start by locating the sample screen's "Stop" button handling and inspect where the recorded file output is configured. Run the sample on an Android phone, click "Stop," and verify whether a video file is created and where it is stored; done means the recording is saved in a discoverable location or the behavior is clearly explained.

Written by the indexing model from the issue text.