Once you are in the Review Setup wizard and uploaded your video, you can increase or decrease its volume. 

Before uploading your video, make sure that you meet these requirements:

• Canvas Size: 1280x720
• Max File Size: 60 MB
• Supported Files: MOV, AVI, WMV, and MP4
• Duration: 2 min max
  
  

Dragging the volume bar to the left decreases the volume while dragging the bar to the right increases your video volume.

Now to listen to the audio’s preview, click the Play button.

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