Hi Erin -- Thanks for your feedback. I branched your comment to a new thread since it sounds like a different question.
Do you mean you want to use images from other websites in a Cascade story? If so, just get the URL of the image and paste it into the box in the Link to Content tab of the Media Picker. That will add the image to your story.
If you mean something else, please provide a bit more detail about what you'd like to do.
Owen Evans
Lead Product Engineer | StoryMaps