@mitsunee If you're on Chrome, install the "Graze" Chrome extension and it will provide expanded previews of all links, not just quotes, along with a bunch of other things.
@mitsunee Graze will hit those links directly from your browser. If the links are visible, and the links loads in your browser, Graze can expand them. If the links won't load in your browser, then the issue has nothing to do with Mastodon.