Taking screenshots and screen recordings relies on two relatively new browser APIs. While they are both supported natively in the latest desktop versions of Chrome and Firefox, in other browsers you may need to enable some experimental settings.

To enable screenshot / screen recording support in Safari:

Go to the Advanced tab in Safari Preferences.
Make sure "Show Develop menu in menu bar" is ticked.
In the Develop > Experimental Features submenu, enable both MediaRecorder and ScreenCapture.
Refresh the deployment preview and try again.
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