SNO Flow allows you to upload all of the relevant images you plan to use for a given story right under the Story dialog window. You can then choose to use or not use those images and decide how they'll be displayed when you push your story to your WordPress site. Below you'll find the three main methods for doing so.
Single Image
Creating a story with a single image is easy and FLOW will automatically assign that single image as your WordPress story's Featured Image
Multiple Images - Slideshow or Photo Gallery
Creating a story with a multiple images selected as a Photo Gallery or Slideshow is also quite intuitive. When multiple images are selected before pushing to your WordPress site, FLOW will automatically set them up as a Slideshow.
Multiple Images - Featured Image with Images in the Post Body
You may also want to create a story that contains multiple images, including a Featured Image at the top, but also a few more throughout the body of the story. FLOW will let you set the main Featured Image for the story and will attach the other images to your post, however you'll need to actually insert those extra images within the body of the post from your WordPress site manually, after the fact.