Hi, @drdantru
Welcome to the Canvas Community! Thanks for that screencast; it's very helpful. It appears that you're trying to move a module into a different module, which is why the action is not succeeding: that's not possible. You can choose to organize all of the chapters into a single module, using text headers and varying the indents to visually differentiate sections within that module, or you can maintain each chapter as its own independent module with its own content.
Does my guess sound consistent with the actions you've been taking?
Also, this resource is helpful in guiding module design and organization: Share UDL Course Design Tips, Tricks, and Techniques ...and for general reference, here's the overview video for modules:
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.