instagram.media.image_size_max - letmepost.dev

What it checks

byteLength <= 8_000_000 per image item.

Why

Meta’s Instagram container endpoint caps photo containers at 8 MB. Larger payloads are rejected at container creation.

Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "instagram.media.image_size_max",
    "platform": "instagram",
    "message": "Image is 9500000 bytes; Instagram allows at most 8000000."
  }
}

Remediation

Re-encode at lower quality or smaller dimensions:

magick input.jpg -quality 85 -resize 2048x2048\> output.jpg

instagram.media.mime_allowed — JPEG-only.