Yes, you can add anything from the Storyblocks library to a folder, including different stock asset types. Just click the Add to Folder icon on any asset, then create or search for a folder to add it to.
Inside your folder, you’ll see tabs at the top for video, audio, and images, which let you view each multimedia type in the folder. You can also download different asset types at once - just select the files you want to download in each tab, then click the Download button in the upper right corner of your folder, next to Select All.
If you run into issues downloading your files, read this article to help troubleshoot.