I'd like to point you to a new piece of documentation that was added the the User Group yesterday: How do I migrate a Canvas quiz to Quizzes.Next?
Depending on your institution, you may be able to migrate a quiz from Canvas to be used in the Quizzes LTI. If you are an instructor and cannot view this feature, contact your institution's Canvas Admin. If you are a Canvas Admin and want to determine if this feature can be enable at your institution, contact your Customer Success Manager.
It's also important to note that not all questions will migrate as expected. Some questions will display as other questions types and others will not migrate at all. For more information on this, please view the guide linked above.