Hello @elh1423
I understand that you are running into issues exporting your quizzes from Canvas. Were you still having trouble with this?
You should be able to export your quiz by using the Quiz export option in your course exports area. If you are hoping to export a quiz and put the in the questions into banks, your questions will need to be placed in the quiz instead of linked a bank, on the quiz that you are trying to export.
HERE is a guide on how to export the quiz into a QTI file.
HERE is a guide on how to import the quiz QTI file and place the questions into a question bank.
If you still need help, it might be best to have you submit a case to Canvas support and have them take a closer look into the issue you were experiencing.