Media send not see preview as we send it manually

[tls-jil]

as I use the following code to send media

issue

1. PDF does not send with the name even if i pass filename [for PDF i used base64 code]
2. on image send not get preview before download

// 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
  );

using the above code i was able o send media but not get blurred preview in WhatsApp chat for more ref i attached a screenshot if any one have an idea how to do that and

send using Script

send Manully