If there is no pre-roll ad to show, the video content will not autoplay. The main reason behind this is that the fill rate is too low. Try increasing your fill rate by following these suggestions:

• Add vi to your ads.txt file.
• Increase your traffic from USA, UK, Germany, Australia, France, Nordics, Benelux, SEA.
• Place the unit above fold.
• Keep the unit floating.

We recommend keeping the vi stories tag live for a minimum of 4 weeks, since fill rate is likely to increase gradually.