My students all used whatever smart phone they have. They’ve never had any problems. Did you let the App have permission to access your camera / camera roll?
No luck for my phone but it worked for my old iPad. I believe this will be very useful in the classroom, thank you for all of your posts. They are very inspiring and full of great ideas!
Teach. Brian. Teach. 
I tried this on my iphone and couldn’t get it to work. All it recorded was a black screen. What device do you use?
My students all used whatever smart phone they have. They’ve never had any problems. Did you let the App have permission to access your camera / camera roll?
It worked on my husbands 10 but not my 10s? It’s driving me crazy.
It shows the image while I’m recording but after analyzing the screen is just black. I am hoping someone out there has a clue.
Any luck figuring it out? Wish I could be more helpful. 😬
No luck for my phone but it worked for my old iPad. I believe this will be very useful in the classroom, thank you for all of your posts. They are very inspiring and full of great ideas!