There are two independent and separate image uploads for Zendesk Guide:
The theme image-assets are for ‘styling’, to be included in the style.css for example.
The image upload within articles is for articles.
The image assets can be updated without changing the link withing the e.g. style.css
The article images are linked to an article and cannot be updated as the link to the image is unique for every uploaded image.
Hence, updating images within articles is a pain, as one image might be used in several articles at several places. It would be great to have an image databank, which is independent of the article and has a defined link to each image. This would make an updating of images so much more convenient.