List View will initially display generic content, so the "Media" column will only display a generic image for the post if added in Step 3: Define Generic Content.
If you did not upload an image in Step 3 and uploaded the image in Step 4, then we will display "No Media" for that post.
Post without media files in Generic Content:
Post with media file in Fine-tuned Content:
You can always upload the image again in Step 3 if you prefer to have the image displayed in List View.
You can learn more about the difference between Generic Content and Fine-Tuned Content in this article.