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

# Prepare Media Asset Upload

> Creates a World Labs media asset upload target

Create a World Labs media asset record and receive an upload URL for an image or video. Upload the binary file to `upload_info.upload_url`, then reference the returned `media_asset.media_asset_id` from `world_prompt` with `source: "media_asset"`.

AI Sonar records the asset owner. Only the same organization can retrieve or use this media asset in world generation.

## Request Body

<ParamField body="file_name" type="string" required>
  Original file name, up to 64 characters.
</ParamField>

<ParamField body="kind" type="string" required>
  Media type: `image` or `video`.
</ParamField>

<ParamField body="extension" type="string">
  Optional extension such as `png`, `jpg`, or `mp4`.
</ParamField>

<ParamField body="metadata" type="object">
  Optional metadata stored with the media asset.
</ParamField>

## Response

<ResponseField name="media_asset" type="object">
  Prepared World Labs media asset metadata.
</ResponseField>

<ResponseField name="upload_info.upload_url" type="string">
  Signed URL where the binary file should be uploaded.
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X POST "https://api.aisonar.dev/v1/worlds/media-assets/prepare-upload" \
    -H "Authorization: Bearer sk-your-api-key" \
    -H "Content-Type: application/json" \
    -d '{
      "file_name": "reference.png",
      "kind": "image",
      "extension": "png"
    }'
  ```

  ```python Python theme={null}
  import requests

  response = requests.post(
      "https://api.aisonar.dev/v1/worlds/media-assets/prepare-upload",
      headers={"Authorization": "Bearer sk-your-api-key"},
      json={"file_name": "reference.png", "kind": "image", "extension": "png"},
  )

  print(response.json()["media_asset"]["media_asset_id"])
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch('https://api.aisonar.dev/v1/worlds/media-assets/prepare-upload', {
    method: 'POST',
    headers: {
      Authorization: 'Bearer sk-your-api-key',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ file_name: 'reference.png', kind: 'image', extension: 'png' })
  });

  const prepared = await response.json();
  console.log(prepared.media_asset.media_asset_id, prepared.upload_info.upload_url);
  ```
</RequestExample>