iOS has a quirk where an app can only display the native alert requesting a specific permission once. If the user declines, and then they retry the action that requires the permission (and on all subsequent retries), it will fail. Currently, we handle this by displaying, e.g., “Error: photo library permissions not granted.” Instead, let’s provide a button that will navigate to the Zulip page in System Preferences and prompt the user to grant it manually. (I know there’s a way to do this linking, as I’ve done it before, but I can’t remember exactly — I think we can use the Linking API from React Native.)