In Web viewer, I configured the properties of iFrame to allow fullscreen.
"data:text/html,<iframe width='560' height='315' src='https://www.youtube.com/embed/hHW1oY26kxQ' frameborder='0' allow='accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture' allowfullscreen='true'></iframe>"
In the screenshots below, it shows that the fullscreen option is still unavailable in WebDirect . Has anyone figured out how to overcome this?