In some cases you might need to insert slide from PowerPoint or Google Slides to your story. This is quite easy to use service such as https://imgur.com where you can easily paste screenshot of your presentation slide or application, and get URL such as https://i.imgur.com/6zqTWb1.jpeg
Section sizes on desktop (width x height):
- Short: 1200 x 150 pixels
- Medium: 1200 x 300 pixels
- Tall: 1200 x 600 pixels
Then place the "Hero Image" widget in a new section within your story, paste the URL and you’re all set!