What's good about Canvas LTI Apps?
When using LTI, Canvas will tell Tychos who is logged in. This allows your students to save copies of your master scenario under their name. If the same student clicks the module again in Canvas, they will get their last saved version of the Scenario instead of the master scenario.
Go to the Scenario you want to add. Take a note of the number in your URL. E.g. tychos.org/scenarios/13 means your scenario is number 13.