Unlock the Editor’s Digest for freeRoula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.Apple is struggling to deliver upgrades to its artificial intelligence voice assistant for the iPhone, with investors downbeat about the potential for major AI announcements at its flagship annual event next week.Recently departed employees told the Financial Times that the Silicon Valley giant has been hit by challenges with updating Siri using cutting-edge large language m...