Blog images not showing up

I have the image URL that shows the images are there, but they show up as an icon. I have added all the blog images to my media library. So all the existing blog posts with image urls and image icons will automatically update the image icon to the image itself? I have over 1000 images to update what is the best way to do this?

At the moment I am seeing that an image icon and the text version of the blog shows that there is an image there,

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