I have an instructor who went to a demonstration of a whiteboard feature found in Google Classroom in the app LIVE. What she wants to do is use a whiteboard app integrated with Canvas during a class lecture...the entire class would participate. It takes the place of the physical white boards in the room. The instructor writes on their personal tablet in the app and the students can see it in the app that is open on their desktop/tablet/smart phone. At the end of lecture, the student can save the entire white board content.
I have created a long list of "whiteboard" apps but I'm hoping so save time testing them myself and leverage the collective genius of this group.