How do I take images by Interval shot using front camera on Galaxy S6/S6 edge?

Using Wide Selfie mode, you can take series of self-portraits at an interval and save photos you want.

1. On the preview screen, tap the icon to switch to the front camera for self-portraits.

2. To change mode, tap MODE icon.

3. Select the Interval shot.

4. Tap the sensor on the back of the device to take a photo of yourself. 
You can also tap the screen to take a photo. The device will take four photos at the two-second intervals.

5-1. To take a photo using your palm, tap settings. 

5-2. Tap the Gesture control switch to activate it. Show your  palm to the front camera.  After recognizing your palm, the device will take a photo after two seconds.

6. The device will take four photos at the two-second intervals.

7. Tick photos you want to save and tap SAVE.