Hello @laura_kovach ...
Quizzes do not have a "Submission Type" drop-down list where you can choose option such as "No Submission", "Online", "On Paper", or "External Tool". Those options only apply to Assignments. External Tools are third-party LTI applications that are typically installed by your school's local Canvas administrator. The are installed at the Canvas account level (rather than the course level) so that all courses at your school can utilize the LTI integration inside of Canvas. For example, some schools have installed the Google Apps and/or the Office 365 LTI integration to allow people to connect their Google or O365 accounts inside of Canvas.
Does this help to answer your question? If not, can you please provide some further explanation so that we can continue to help you out? Thanks...be well, and stay safe.
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