iPad Pro for online teaching

As the recent change, I believe many teachers and professors need to use online teaching. I think writing on slides on PDF files are very important for education in many counties. But I find it is extremely difficult to use iPad Pro and my apple pencil.

My school uses Blackboard and I believe Blackboard is very standard education system in US. Students have easy access to it and can download course materials. The Blackboard on iPad APP gives zero flexibility to record the course. Then, I do not know how to use iPad Pro in this writing and recording task. I have to use the laptop and other connect tablet.

I would like to open this discussion because I think Apple should improve this part. If anyone knows how to use iPad Pro in Blackboard recording, please share with us. I appreciate that.