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Documentation Index

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What it checks

The reachability probe of pinterest.coverImageUrl records the response’s Content-Type header. If it isn’t one of the allowlisted image mimes, preflight fails before the video upload runs. Allowed: image/jpeg, image/png, image/webp.

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Why

Pinterest’s pin endpoint expects the cover URL to serve a real image — HEIC, GIF, AVIF, or application/octet-stream from a misconfigured CDN all surface upstream as opaque pin failures. Preflight maps that to a clear remediation.

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Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "pinterest.cover_image.mime_allowed",
    "platform": "pinterest",
    "message": "Cover image mime type 'image/heic' is not allowed on Pinterest.",
    "remediation": "Use one of: image/jpeg, image/png, image/webp."
  }
}

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Remediation

Re-encode the cover image to JPEG: 
sips -s format jpeg cover.heic --out cover.jpg
# or
ffmpeg -i cover.heic cover.jpg
Then host the JPEG (or PNG / WebP) URL.