how to make a downloaded file has file name + file extension in its name?

I want to download the file from 'File Upload' Field in Zoho CRM, after download the file then I will upload it to our own image server to create a download URL link. I wrote the code below.

but the problem is, the file name doesnt have file extension in it. so how to include a file name + file extension in the downloaded file name?

here is the code I use:

// fetch CRM Deal Details
v_Module = "Deals";
v_dealID = DEAL_ID;
v_Endpoint = "https://www.zohoapis.com/crm/v7/" + v_Module + "/" + v_dealID;
r_DealDetails = invokeurl
[
url :v_Endpoint
type :GET
connection:"zoho_crm_connections"
];
m_DealDetails = ifnull(r_DealDetails.get("data").toMap(),Map());
if(!isNull(m_DealDetails.get("Product_Attachment")))
{
l_Files = List();
for each m_FileUpload in m_DealDetails.get("Product_Attachment")
{
// get files from Zoho CRM
v_FileDownloadUrl = "https://www.zohoapis.com/crm/v7/files?id=" + m_FileUpload.get("File_Id__s");
v_FileName = m_FileUpload.get("File_Name__s"); // I am trying to get name and extension in here
f_MyFile = invokeurl
[
url :v_FileDownloadUrl
type :GET
connection:"zoho_crm_connections"
];
f_MyFile.setParamName("file_data");
f_MyFile.setFileName(v_FileName); // set the file name in here but it doesnt work
l_Files.add(f_MyFile);
}
if(!l_Files.isEmpty())
{
first_file = l_Files.get(0);
// send first file only to Blueray Server
bodyMap = Map();
bodyMap.put("file_data",first_file);
fileResponse = invokeurl
[
url :"https://myAPI.com/file/upload"
type :POST
parameters:bodyMap
];
file_url = fileResponse.get("file_url");
// update the field in deal module
update = {"Product_Attachment_URL":file_url};
zoho.crm.updateRecord("Deals",DEAL_ID,update);
}
}

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