How to have changes made in media library to be reflected on posts/pages

If the image is the featured image or some image inserted via a shortcode, then those changes will reflect automatically(if they don’t, it’s your theme’s fault, you’ll have to edit your theme)

If the image is inserted into the post content, yes you’ll have to go through each page/post & manually do the changes. Though updating them in media library assures that they will be inserted right the next time you insert the same images.

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