Overviewer - Turn Your iPhone or iPad Into a Document Camera in Zoom

Thanks to a recent article on The Verge I just learned about a new, free iPhone and iPad app called Overviewer. Overviewer is a free app that lets you use your iPhone or iPad as a document camera during a Zoom meeting. The app essentially mirrors your iPhone or iPad camera into Zoom via Airplay or Lightning Bolt cable. 

Here's an overview of how Overviewer works. 

Unfortunately, there isn't a similar Android app available right now that I'm aware of. However, I have been successful in sharing my Android screen through a USB cable with a free desktop program called Vysor. 

 
Applications for Education
This could be a great app for anyone who has an iPhone or iPad and needs a document camera for online instruction. I haven't had a chance to try it yet this morning, but my plan is to use the Zoom annotation tools to highlight while using the Overviewer app in a remote lesson.