The thumbnail version of the contact’s profile picture.
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- watchOS 2.0+
thumbnail property is derived from the
image property, including cropping information from vCards or edits from contact viewing. It is recommended that you fetch this property only when you need to access its value, such as when you need to display the contact’s profile thumbnail picture.