# XArticleEntityOneOf2ValueData
## Properties
**url** | **String** | Public image, GIF, or MP4 URL. Zernio uploads it to X and replaces it with native media metadata. Caller-supplied media IDs are rejected. |
**caption** | Option<**String**> | | [optional]
**alt_text** | Option<**String**> | Supported for image and GIF URLs; rejected for MP4 media. | [optional]
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