Steps to Enable Flashlight in Portrait Mode
1. First you have to go to Google Playstore and search for an app called Fingerprint Action pro.
2. Download and install the application and give all the necessary permissions.
3. Open the application and choose any one of the actions (swipe up /down/double tap/swipe right )
4. And then choose the action as Toggle Flashlight and then enable the Fingerprint action pro toggle.
5. Now open up your camera app and then enble the potrait Mode.
6. Now, just use the gesture to turn on the Flashlight, Voila!! You have turned on Flashlight in Portrait Mode, Enjoy clicking awesome Night Portraits..!!