Tagged “troubleshooting”
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Open Graph mistakes, in order of how often they happen
A checklist of what actually goes wrong with link previews, ordered by frequency, each with the one-line fix and how to confirm it.
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You can't change someone else's link preview
The preview comes from the destination page's own tags. Which means only whoever controls that page controls the card — and why that boundary matters.
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Preview crawlers and JavaScript
Most link-preview crawlers do not run JavaScript. If your tags are injected client-side, they are invisible — and it looks fine in your browser.
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How to refresh a cached link preview
Use the platform's own debug tool to force a re-fetch, and change the image filename. Why one without the other often fails.
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Why your link preview shows the wrong image
Almost always a cache. The platform built a card once, kept it, and your edits since then are invisible to it.