@shaderdev Good day, 

For Tapo camera,  the rotation range for 'Down' is very small, if your set 'invert image' on tapo camera, then the rotation range for 'Up' will become very small but 'Down' direction has larger range. 

That means when "invert image" is selected on app, the upward boundary becomes smaller, so it looks like ‘ Up’ direction does not work. 

In such case, it is recommended adjusting the location of your camera if you need more range in 'Up' direction.

@shaderdev Thanks so much for sharing all the detailed info, this issue you are experiencing sounds unusual. To address the issue and try to fix it, we would like to have a specialist look into this further via email. Please check your mailbox later, and let us know if the issue is resolved. Thank you!