> ## 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.

# twitter.media.image_video_exclusive

> A tweet can carry images OR a video, not both.

## What it checks

If the same `media` array contains at least one item with `kind: "image"` and at least one with `kind: "video"`, preflight fails before bytes resolve.

## Why

X enforces this at the API level — `/2/tweets` rejects mixed-media payloads. Catching it locally surfaces a clean rule id instead of a generic 400 from upstream.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "twitter.media.image_video_exclusive",
    "platform": "twitter",
    "message": "Cannot attach both images and video to the same tweet — X requires picking one.",
    "remediation": "Split into separate tweets: one with images, one with the video."
  }
}
```

## Remediation

Two tweets in a reply chain — first one with images, second one with the video, threaded via `twitter.replyToTweetId`:

```json theme={"system"}
{ "media": [{ "kind": "image", "mediaId": "med_…" }] }
```

```json theme={"system"}
{
  "media": [{ "kind": "video", "mediaId": "med_…" }],
  "twitter": { "replyToTweetId": "<id of first tweet>" }
}
```

## Related

* [`twitter.media.count_max`](/preflight/twitter-media-count_max)