Adobe CEO Shantanu Narayen speaks during an interview with CNBC on the floor of the New York Stock Exchange on Feb. 20, 2024.Brendan Mcdermid | ReutersAdobe on Monday released its artificial intelligence assistant, which helps users understand the contents of digital documents. Monthly subscriptions start at $4.99.As part of the release, Adobe is also launching a free mobile version of the tool in beta that can respond to voice commands, and is bringing the service to extensions on Microsoft Edg...