You can publish Storyline courses, Presenter presentations, Quizmaker quizzes, and Engage interactions to Articulate Online.
However, you can't download or reverse-engineer content items from Articulate Online.
To edit an Articulate Online content item, open the original project file with Storyline, Presenter, Quizmaker, or Engage. Then make your changes and publish the project to Articulate Online again. As long as the title remains the same, you'll be prompted to update the existing content item in Articulate Online.