> ## Documentation Index
> Fetch the complete documentation index at: https://docs.letmepost.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# instagram.media.count_max

> Instagram carousels cap at 10 mixed media items.

## What it checks

`media.length <= 10`. Carousels can mix images and videos (since IG Graph API v15).

## Why 10

Meta's Instagram Content Publishing API documents `CAROUSEL` containers at 2–10 children. Above that the create-container call returns an opaque `code 100`.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "instagram.media.count_max",
    "platform": "instagram",
    "message": "Attached 12 media items; Instagram allows at most 10 per carousel.",
    "remediation": "Reduce to 10 items or fewer."
  }
}
```

## Remediation

Trim to 10. If you have more, post the rest as a follow-up — IG doesn't support carousel-of-carousels.

## Related

* [`threads.media.count_max`](/preflight/threads-media-count_max) — Threads caps higher (20).