How do I make flash card interactions accessible for screen readers?

"Rise 360 provides instructions for interactions with the exception of sorting activities, carousel interactions, flashcards, and matching drag-and-drop questions. Until we make these interactions fully accessible, you’ll want to use a text block to provide instructions." https://articulate.com/support/article/Rise-360-How-to-Design-an-Accessible-Course#Interactive

This is the text that articulate has posted in their support pages. How does providing a text box with instructions make an interaction fully accessible? Will a screen reader read a flash card? What does "provide instructions" mean? What do those instructions need to include?