NSExtension NSExtensionAttributes PHSupportedMediaTypes Video Image NSExtensionActivationRule NSExtensionActivationSupportsText NSExtensionActivationSupportsWebURLWithMaxCount 1 NSExtensionActivationSupportsImageWithMaxCount 100 NSExtensionActivationSupportsMovieWithMaxCount 100 NSExtensionActivationSupportsFileWithMaxCount 100 NSExtensionMainStoryboard MainInterface NSExtensionPointIdentifier com.apple.share-services