The media preferences allow you to easily set up nessViewer for your task:
Open media normally
This mode is optimal if media should be prepared mainly.
Automatically add media to media show
This mode is optimal if media should be collected in media shows at first.
Especially recommended if folders or even volumes are opened in nessViewer.
Automatically present media
This mode is optimal if media should be presented basicly.
If the media preferences are set to "Open media normally" and more than 3 media are found, then these media will always be added to a (new) media show.