连接到Rev API Net Core

Question

我在发布到API时遇到问题。发送Httpclient请求中的文本项。我遇到的问题是当我将链接发送到API（requestBody.media_url）时。此链接必须是公共网址。我曾经使用ngrok将文件夹公开为公用文件夹（在wwwroot中）。然后，外部API无法从该文件夹下载文件。 外部api是Rev.Ai

public async Task<ResponseBody> SendAudio()
        {
            RequestBody requestBody = new RequestBody();
            //requestBody.media_url = string.Format("https://xxxx.ngrok.io/Audios/09b69907-b863-4587-be19-fe98301179b8.mp3");
            //requestBody.media_url = string.Format("https://drive.google.com/file/d/xxx/view?usp=sharing");
            requestBody.media_url = string.Format("https://drive.google.com/file/d/xxx/view?usp=sharing");
            requestBody.skip_diarization = "false";
            requestBody.skip_punctuation = "false";
            requestBody.remove_disfluencies = "false";
            requestBody.filter_profanity = "false";
            requestBody.speaker_channels_count = null;
            requestBody.delete_after_seconds = "2592000";
            requestBody.custom_vocabularies = "";
            requestBody.metadata = "sample metadata";

            var stringContent = new StringContent(JsonConvert.SerializeObject(requestBody), Encoding.UTF8, "application/json");
            client.DefaultRequestHeaders.Authorization = GetAuthenticationHeader();
            var response = await client.PostAsync(urlPath, stringContent);
            var temp = await response.Content.ReadAsStringAsync();
            return JsonConvert.DeserializeObject<ResponseBody>(temp);
        }