Microsoft graph api 有没有办法用代码片段发布消息？

通过端点上传图像作为托管内容的新方法非常棒！但是，有没有一种方法可以将文本/纯文本作为托管内容上传，以便在消息中发布代码片段卡？ 我已经尝试上传文本，但响应给了我一个错误，说唯一允许的内容类型是'image/jpg，image/jpeg，image/png'

请求示例：

{
    "body": {
        "contentType": "html",
        "content": "<attachment id=\"4d92eb51ab9c48ebb5b364794a2fa569\"></attachment>"
    },
    "attachments": [
        {
            "id": "4d92eb51ab9c48ebb5b364794a2fa569",
            "contentType": "application/vnd.microsoft.card.codesnippet",
            "contentUrl": null,
            "content": "{\"name\":\"\",\"language\":\"CSharp\",\"lines\":1,\"wrap\":false,\"codeSnippetUrl\":\"../hostedContents/1/$value\"}",
            "name": null,
            "thumbnailUrl": null
        }
    ],
    "hostedContents":[
        {
          "@microsoft.graph.temporaryId": "1",
          "contentBytes": "VGVzdA==",
            "contentType": "text/plain"
        }
    ]
}

---

我在GitHub文档中收到了一个答案：

目前不支持代码段。他们在需要支持的事情清单上，但还没有时间表可以分享

{
    "error": {
        "code": "BadRequest",
        "message": "Unsupported content type in hostedContent with Id '1'. Allowed values are 'image/jpg,image/jpeg,image/png'",
        "innerError": {
            "date": "2020-10-07T12:17:15",
            "request-id": "ed24f5df-3e1f-4871-b430-e4c1c9f30348",
            "client-request-id": "ed24f5df-3e1f-4871-b430-e4c1c9f30348"
        }
    }
}