Using voice commands for capturing photos allows you to easily get the most pleasing shots.
Capturing photos with voice commands on OPPO A37 (A37fw) is as follows:
Step 1: Access the 'Camera'.

Access the 'Camera'.
Step 2: Select the circular icon.

Select the circular icon.
Step 3: Choose 'Voice Command'.

Choose 'Voice Command'.
Following the aforementioned steps, we can easily capture attractive 'selfie' photos. Best wishes for your success.
