I am trying to upload a video to Tiktok using this endpoint:

https://open-api.tiktok.com/share/video/upload/

Following the official docs: https://developers.tiktok.com/doc/web-video-kit-with-web

(After successfully authenticating with Tiktok and getting an access token using the Login Kit API). I am getting a response that suggests success (with error_code=0 and a non-empty share_id), however nothing gets uploaded and my Tiktok app's callback url does not seem to be getting triggered with any status update.

I've tried hitting the API from several different environments - a Node.js runtime (using Axios), a cURL request from 2 different machines (all getting the result described above) and also from my frontend code using Fetch (this one got me a CORS error). Code snippets below.

Will appreciate any help since I'm out of ideas as for what to try next. Also if there are any other docs or online resources besides the one I linked to that might be helpful, any links to such will be great.

Note: I made sure my test videos are satisfying the constraints mentioned in the docs.

My Node.js code:

    const url = `https://open-api.tiktok.com/share/video/upload?open_id=${openId}&access_token=${accessToken}`;
const data = new FormData();
data.append('video', fs.createReadStream(path.join(os.tmpdir(), 'test.mp4')));
await axios.post(url, data, {
  headers: data.getHeaders()
});

cURL request:

curl --location --request POST 'https://open-api.tiktok.com/share/video/upload?open_id=<open_id>&access_token=<access_token>' --form 'video=@"/path/to/video.mp4"'

Response payload (for both cURL and Node.JS requests):

{"data":{"err_code":0,"error_code":0,"share_id":"video.7031619168818448385.CGdXCmaC"},"extra":{"error_detail":"","logid":"2021111721133201024513311411A971D3"}}

Frontend code (Fetch, getting a 307 response with the same Tiktok URL (/share/video/upload...) in the Location header - resulting in CORS error):

const formData = new FormData();
formData.append('video', selectedFile);

const requestOptions = {
  method: 'POST',
  body: formData,
  redirect: 'follow'
};

const URL = `https://open-api.tiktok.com/share/video/upload?access_token=${accessToken}&open_id=${openId}`;

fetch(URL, requestOptions)
  .then((response) => response.text())
  .then((result) => console.log(result))
  .catch((error) => console.log('error', error));