Before you take a study, make sure you have granted the screen recorder permission to record your screen.
You can do that by going to your device settings and enabling the screen recorder.
Your device may prevent the screen recorder from recording your screen for security reasons. Granting permission to the screen recorder will bypass it.
Here's how to grant permission on Mobile;
Go to "Settings" > Click on "Apps" > Find and click on "PlaybookUX" > Under "Allowed", Select "Files & Media" > Select "Allow access to media only"
What "Allow access to media only" means;
This is a scoped storage and it is the same as the default settings applied to your Gmail, Drive, Instagram and Phone. If scoped storage is enabled, the collection shows only the photos, videos, and audio files that the app has created.