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What it checks

For images: mimeType ∈ { image/jpeg, image/png }. For videos: mimeType ∈ { video/mp4, video/quicktime }. WebP, HEIC, GIF on the photo path will fail upstream with opaque code 100.

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Remediation

Re-encode to JPEG or PNG for images; mp4 (H.264 + AAC) for video.