The app works and works well. If you decide to download the app for your Z10 (and honestly we believe this is the best darned flashlight out there!) and you happen to find any bugs, please notify us ASAP. We're extremely responsive and will work to get an update out ASAP.
Our aim is for this app to be the ultimate flashlight app.
Note: A common "issue" is that people click "no" when the app first asks for permission to use the camera. This permission is necessary in order to access the flash. If you happen to click "no" the flashlight won't work and you will need to go to the app permissions to update it. The app does NOT take photos or access your camera in any other way, apart from the flash. This is the same as with all flashlight apps.