What is Reddit's opinion of Floating Draw?

From 3.5 billion Reddit comments

Have read your update, how about the following solution? She casts her entire screen (using the Cast app) and then uses this - Floating Draw - to write at any point on her phone, either over her browser, a PDF document etc. That should work.

App: Floating Draw

https://play.google.com/store/apps/details?id=onscreen.draw

Lets you make screenmarkers.

Thanks!

Play Store link: https://play.google.com/store/apps/details?id=onscreen.draw