[Python] File is not showing the the slack channel

I am using Node.js, I want to send a file to Slack, I am using getUploadURLExternal and completeUploadExternal functions. My initial message (Incident detected .....) were displaying in the Channel and file also stored successfully as I see url_private in the logs but not displaying file I stored, in the Channel I mentioned, below is my code.

const messageRes = await web.chat.postMessage({
channel: "#jr-developers",
text: " Incident detected! Please check the attached report below.",
});

console.log("Message sent:", messageRes.ts);
// console.log(messageRes);

// Step 3: Upload file content to the URL using axios
const fileName = "continent.csv";
const fileBuffer = fs.readFileSync(fileName);
const fileLength = fileBuffer.length;

// Step 2: Get upload URL from Slack
const uploadURLRes = await web.files.getUploadURLExternal({
filename: fileName,
length: fileLength,
});

const uploadUrl = uploadURLRes.upload_url;
const fileId = uploadURLRes.file_id;

console.log("Received upload URL from Slack.", uploadUrl, fileId);

await axios.put(uploadUrl, fileBuffer, {
headers: {
"Content-Type": "application/octet-stream",
"Content-Length": fileLength,
},
});

console.log("File uploaded to Slack storage.");
// console.log(axiosRes);

// Step 4: Complete the upload and share in thread
const res = await web.files.completeUploadExternal({
files: [
{
id: fileId,
title: "slack-test",
},
],
channel_id: messageRes.channel,
thread_ts: messageRes.ts,
});



console.log("File attached to thread successfully.");


These are the logs,

{
ok: true,
files: [
{
id: 'F0****J3A',
created: ***,
timestamp: ***,
name: 'continent.csv',
title: 'slack-test',
mimetype: '',
filetype: '',
pretty_type: '',
user: '***',
user_team: '***',
editable: false,
size: 86,
mode: 'hosted',
is_external: false,
external_type: '',
is_public: false,
public_url_shared: false,
display_as_bot: false,
username: '',
url_private: 'https://files.slack.com/files-pri******continent.csv',
url_private_download: 'https://files.slack.com/files-pri*****download/continent.csv',
media_display_type: 'unknown',
permalink: 'https://profitops.slack.com/files****continent.csv',
permalink_public: 'https://slack-files.com/*****',
comments_count: 0,
is_starred: false,
shares: {},
channels: [],
groups: [],
ims: [],
has_more_shares: false,
has_rich_preview: false,
file_access: 'visible'
}
],
response_metadata: {
scopes: [
'identify', 'channels:history',
'groups:history', 'im:history',
'mpim:history', 'channels:read',
'groups:read', 'im:read',
'mpim:read', 'users:read',
'channels:write', 'chat:write',
'files:write', 'groups:write',
'im:write', 'mpim:write',
'identity.basic', 'identity.email',
'identity.avatar'
],
acceptedScopes: [ 'files:write' ]
}
}
File attached to thread successfully.


I have checked everything. please help.

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