Canvas, the online learning platform used by schools and universities in Southern Nevada and worldwide, was back online for most users late Thursday after it went offline following a cyberattack . Instructure, the Salt Lake City-based parent company of Canvas, said through a post on its website that most users were able to access Canvas as of Thursday night. “Instructure discovered the unauthorized actor involved in our ongoing security incident made changes to the pages that appeared when some students and teachers were logged in,” Instructure said Friday in a statement. “Out of an abundance of caution, we immediately took Canvas offline to contain access and further investigate.” A hacking group named ShinyHunters had claimed responsibility for the breach, Luke Connolly, a threat analyst at the cybersecurity firm Emisoft, told The Associated Press.…