Canvas has a tool for validating links in your course. It is a good idea to run it when you copy content from a previous quarter's shell or a master class, or after you update your course. The validator identifies:

Links to content in another shell
- This is the most common service request.
- Links that point to internal files or pages in a class in pages, or descriptive text in discussions, quizzes, etc. may not update when content is imported into the current shell.
- Students will receive a message saying they don't have permission to view the page or file.
- Links in modules should update if the file is linked within the class.
Broken links
- External links may actually work, but the validator can't tell, however if it flags them, you can check the link.
Unpublished content
Deleted content
- You can sometimes retrieve deleted content by adding '/undelete' to the end of the course base URL. This would probably have to be done to the source shell, rather than the copy.

To access the “Validate Links in Content” tool, go to the course settings page and click on the button in the group of buttons on the right (or bottom if you have a narrow screen).

Screenshot of course settings page with arrow pointing to link validation button

Validate Links in Course Button

Here is an example of the results:

Screenshot of unresponsive links report with arrows pointing to class ID numbers

Note that the arrows are pointing to the course numbers abive (used by Canvas) and they differ from the current course number:

Image of course URL with arrow pointing to course number

Students won't have permission to view content in other courses.

To fix those links, edit the pages and re-insert the linked content from the current course, or make other changes, as appropriate.

For more information, see Canvas help page, "How do I validate links in a course?".