Importing a QTI.zip file into a course
After exporting a quiz in QTI format you can import into a Canvas course by going to the settings page and clicking Import content as shown below:
Next choose the QTI.zip file to be imported and select the name of the question bank to import it into, as shown below:
When the import is completed (as shown below):
You can now select the Quizzes page and you will see that the questions have been imported: