on media send not able to send PDf with my own file name

[tls-jil]

I have the following code for sending media for using base64 and direct URL

while only facing issue with the PDF on other doc files it's properly working for more ref I attached a screenshot

// if get media direact URL
messageContent = {
[mediaType]: {
url: image,
mimetype: mimeType,
fileName: file_name,
},
caption,
};

// if get base64
messageContent = {
[mediaType]: mediaBuffer,
mimetype: mimeType,
fileName: file_name,
caption,
};
}

  console.log("messageContent :>> ", messageContent);
  const sendResult = await wpClient.sendMessage(
    `${number}@c.us`,
    messageContent
  );

Reference Screenshot

[tls-jil]

if i send pdf with base64 then it's send properly with PDF name or other doc name but I have direct file URL and file name

const sendMedia = async (
wpClient,
number,
URL,
file_name,
caption = "",
mediaType = undefined
)

// Convert to Base64 for URLs without extensions
        const base64Result = await convertUrlToBase64(image);
        if (base64Result.status === 1) {
          const { data: base64Data, mimeType } = base64Result;
          // Determine media type

          // Convert Base64 to Buffer
          const mediaBuffer = base64Data.includes("data:")
            ? Buffer.from(base64Data.split(",")[1], "base64") // Extract payload if data URL
            : Buffer.from(base64Data, "base64"); // Raw Base64 without data URLExtract payload
          const mediaType = mimeType.startsWith("image")
            ? "image"
            : mimeType.startsWith("video")
            ? "video"
            : mimeType.startsWith("audio")
            ? "audio"
            : "document"; // Default to document for other types
          messageContent = {
            [mediaType]: mediaBuffer,
            mimetype: mimeType,
            fileName: file_name,
            caption,
          };
        }
        
        const sendResult = await wpClient
        .sendMessage(
          // `${number}@c.us`,
          `${number}@s.whatsapp.net`,
          messageContent
        )
        .catch((err) => {
          return isMessageSend;
        });

      console.log("sendResult :>> ", sendResult);