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What it checks

Active probe — we HEAD the image URL during preflight. If the response isn’t a 2xx that resolves to image bytes, the rule fires. Same failure modes as instagram.media.reachable: Drive share links, Dropbox previews, S3 with restricted ACLs.

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Remediation

Use POST /v1/media and reference the returned mediaId. The result URL is on our public CDN and Pinterest fetches it cleanly.