| Name | Type | Description | Notes |
|---|---|---|---|
| r#type | Type | Must match the template header's media type. (enum: image, video, document) | |
| link | Option<String> | Public URL of the asset to send. Must be reachable without auth. | [optional] |
| id | Option<String> | A Meta media id (from the media upload endpoint), as an alternative to link. | [optional] |
| filename | Option<String> | Document display name shown to the recipient (e.g. "Factura 0001-123.pdf"). document type only; ignored for image/video. | [optional] |