I think the best option is to include an Object derived type, like Page or Article, at the top level. Link has limited metadata. I don't think attachment -> Link -> preview -> Article is the shortest path to getting metadata shared to the client.
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Evan Prodromou
@eprodrom@socialhub.activitypub.rocks
Post
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skavish:Unfortunately it will not solve this problem if the link to the image preview still leads to the origin server (server the link points to) because requesting this image is loading the server, not requesting the link itself