All footage disappears after extending composition duration
Hi,
I hope this problem has a relatively simple answer.
I am creating an animated infographic and I had orginally set the composition to be 30s long.
Near completion of the animation I realised that it needed to be longer so I went to the composition settings and extended the duration to 90s.
However, after the extension the video still plays as normal until the 30s when everything just disappears and the composition reverts to its background colour.
How do I get everything to remain in place from 30s to the complete 90s?

