You need to be connected to the internet to apply Green screen.
Green screen is a powerful feature that uses Artificial Intelligence to remove the background from a video. Add the effect and Descript will analyze and remove the background. Once the effect has finished processing, you can toggle it on and off from the properties panel.
When you apply Green screen, a message will appear indicating that it’s being applied to the visual layer. This may take several minutes, depending on the size of your file.