通过Tyntec发送PDF至iOS端WhatsApp显示为无标题问题排查

我通过第三方服务Tyntec对接WhatsApp消息，自研API借助Tyntec向指定号码发送PDF文件。Android用户接收时PDF名称显示正常，但iOS端WhatsApp接收后文件显示为“Untitled”，打开文件时名称也异常。以下是对接Tyntec的C#代码片段及相关截图，目前无法定位问题，寻求帮助。

代码片段 #

public async Task<SendingMessageRespons> SendRequestAsync(object requestBody)
{
    var serializedRequest = "";
    try
    {
        serializedRequest = JsonSerializer.Serialize(requestBody, new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            IgnoreNullValues = true
        });

        var requestContent = new StringContent(serializedRequest, Encoding.UTF8, "application/json");

        var client = new HttpClient();

        client.DefaultRequestHeaders.Add("apikey", _config.APIkey);

        var response = await client.PostAsync(_config.APIUrl, requestContent);

        var content = await response.Content.ReadAsStringAsync();

        if (response.IsSuccessStatusCode)
        {
            var message = JsonSerializer.Deserialize<Message>(content);

            return SendingMessageRespons.Create(response.StatusCode, serializedRequest, content, message.messageId);
        }

        else
        {
            return SendingMessageRespons.Create(response.StatusCode, serializedRequest, content, string.Empty);
        }

    }
    catch (Exception ex)
    {
        return SendingMessageRespons.Create(HttpStatusCode.ExpectationFailed, serializedRequest, ex.Message, null);
    }

}

相关截图 #

• 配置截图：
• Android端显示效果：
• iOS端显示效果：
• 打开文件时的名称：

内容的提问来源于stack exchange，提问作者Hady Salah