When you download Royalty Free Footage videos using Doodleoze Free Footage Module they are saved inside your Doodleoze program files directory (Windows) or inside the Explaindio Elements application folder (Mac) you will find a folder named creative_commons_videos. When you download any video using the Royalty Free Footage Module, they are saved inside this folder. To add downloaded videos to your scene, you'd need to browse this folder or you can cut/copy them from this folder to your desired destination and then add them to your projects. 

On Windows system, the default installation directory is: C:\Program Files (x86)\Doodleoze

And, on Mac the default installation directory is: /Applications/Doodleoze.app/Contents/Resources