The live camera or live screen streaming feature shows a blank/black preview. What could cause this?

For Live Camera Streaming, a blank preview may occur if the target device is resting face-down, covering the front camera. Try switching to the rear camera to see if that resolves the issue. For Live Screen Streaming, a black preview typically means the target device's screen is off or inactive. This feature only works when the target device screen is actively in use. If you receive a connection error rather than a blank preview, provide a screenshot of the error message to support for further diagnosis.