This idea has been developed and deployed to Canvas
Please add a "Solutions" option on quiz questions. We can add comments to essay questions in Canvas for students but there is no place to add "Solutions" to each question for Instructors grading the exam. This is helpful to instructors, when grading, to see the solution as well as the student's answer. This feature is very important on questions from a random draw pool because the instructor sees the question, student response, and solution no matter which questions are drawn from the pool.
Comments from Instructure
This idea was completed with general availability of Quizzes.Next. You can find more information about the overall project in the Quizzes.Next User Group.
Quizzes.Next is now available for all paid accounts.
Quizzes.Next updates will be included in the Canvas Release Notes.This includes new features, updated features, and relevant fixed bugs. New and updated features will be deployed to Quizzes.Next near the same time as the Canvas release. Fixed bugs may be deployed at any time.