Narrative is really clever and there is no need to set the width of an image, it does it automatically!

When you publish a post, a high resolution imaged is upload to the Narrative Cloud, and then based on the viewer's device, a smaller image will be served to them, this ensures that they will get the fastest experience when viewing your blog, and won't chew their data, because of the way Narrative Compression works, you won't be sacrificing image quality.

Multiple different files of different widths will be stored in the cloud

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