I have been having a problem that has never occurred before in my years of using Canvas.

I imported a course pack from a textbook publisher to utilize a few elements, such as quizzes, in my course. However, when trying to add one of these imported assignments, they are not listed in the "add item" menu (none of them) - only assignments I have created natively show up in the add item menu. 

Is this something others have experienced? 

Do you think it has to do with the course pack I uploaded?

The only workaround I can find is an extremely inefficient copy-and-paste method.