The annotation tools work fine for mouse, but for touchscreen it does not seem to be working. It looks like its not detecting the touch drag movements and/or the touch clicks correctly. Please refer to the following video:
Is there a way to get it working like the Microsoft Paint application shown at the end?
This issue has been logged on GitHub. We’ll further investigate it. Please follow this link for future correspondence. However, as there is any update, you’ll be notified here as well.