This article explains the camera icons and how to use the camera live view. 

• Mic: To use the mic select and hold the mic icon. 
• Video Quality: Set the video quality to SD or HD by selecting the auto-icon. video quality is set to auto by default. This option will select the best option based on your Internet speed and connectivity. 
• Photo: to take a photo, press the camera icon. The photo will be stored in the phone's photo app
• Video:  to manually record a video, tap the video icon then tap again when you're done. The photo will be stored in the phone's photo app 
• Speaker: To turn the sound on or off tap the speaker icon
• Full Screen: To view full screen, select the full-screen icon. This will allow you to use live view in landscape mode.