The Storie Web Clipper extension makes it really easy to add pictures you find anywhere on the web to your stories. Use it to quickly create scrapbooks of your favorite things or import your photos from any photo hosting site.
To use the Web Clipper, just right-click over any image and select "Post image to Storie." Web Clipper will take care of the rest, including providing appropriate attribution when the image is shown on Storie.
Note: Storie Web Clipper uses Google Analytics to gather anonymous stats to help us improve our product.