Why did Apple's mobile phone pause recording?

The camera that comes with Apple's mobile phone can't be paused, and it can only be paused when using a "third-party camera" to shoot video.

Materials/tools: iPhone8.

The specific operation includes the following steps:

First, open the "App Store" on the phone desktop.

Second, enter "B6 12 camera" and click Search (or other third-party cameras are also acceptable).

Third, choose "B6 12 camera" (or other third-party cameras) to download and install.

4. Open "B6 12 Camera" after downloading, and click "Video" mode below to enter.

5. Click the "Photography" icon in "Video" mode to record.

6. Click the Pause icon to stop recording.

7. Finally, you can choose to click the "button" here to continue recording, or click the "pink arrow" sign to save.