To add a media placeholder, from the “Objects” menu choose “Media Placeholder ” you can then add any media you would like to that object. You can do that by choosing the media in the inspector and dragging it into the media placeholder object.
To add a media placeholder, from the “Objects” menu choose “Media Placeholder ” you can then add any media you would like to that object. You can do that by choosing the media in the inspector and dragging it into the media placeholder object.