I have loads of quiz questions to import - is there some way that I can import them from an excel or similar file?
Sorry, but option of quiz import is only available when you are importing from an existing PowerPoint project containing a quiz made in Presenter.
To get more details about quiz import, kindly visit- https://helpx.adobe.com/presenter/using/adding-quizzes-questions.html#importing_questions_ from_existing_quizzes
Please mark this answer as correct if you find it helpful.
Let me know if you need any further assistance.
Adobe Presenter Engineering Team