Can't upload file to YouTube using API

I keep getting a 401 error when I try to upload a file to YouTube on my application. This is the YouTube docs: https://developers.google.com/youtube/v3/docs/videos/insert

I'm using HTTP as the method for uploading. This is what YouTube suggests you to upload a video as you can do this without any meta data:

POST https://youtube.googleapis.com/youtube/v3/videos?key=[YOUR_API_KEY] HTTP/1.1Authorization: Bearer [YOUR_ACCESS_TOKEN]Accept: application/jsonContent-Type: application/json

I have my application setup in a react/typescript environment, with a node/express backend.

This is how I have written the api call using axios:

export const UploadNewYouTubeVideo = (uploadFile: File, token: string) => {  return axios.post(    `https://youtube.googleapis.com/youtube/v3/videos?key=${process.env.REACT_APP_YOUTUBE_API_KEY}`,    uploadFile,    {      headers: {        Authorization: `Bearer ${token}`,"Content-Type": "application/octet-stream",      },    }  );};

I know the access token passed is correct for the YouTube channel as it successfully allows me to view/delete existing videos with that token.

For the frontend, I have a very simple useState hook that changes to the inputted file on input:

<input                  id="file-upload"                  name="file-upload"                  type="file"                  className="sr-only"                  onChange={(e) =>                    e?.target.files !== null &&                    setUploadFile(e?.target?.files[0])                  }                />

This corresponds to a simple function that calls that api when a button called "Upload" is pushed:

  const UploadVideo = () => {    if (uploadFile) {      setIsUploading(true);      return UploadNewYouTubeVideo(uploadFile, token)        .then((res) => console.log(res))        .catch((e) => console.log("Error Uploading", e.message));    }  };

This is the 401 error I keep getting (note: I hid my secret key here with XXXX):

xhr.js:210 POST https://youtube.googleapis.com/youtube/v3/videos?key=XXXXXXXXXXXXXX net::ERR_FILE_NOT_FOUND

The file is definitely being saved to state and passed to the post request:

I'd appreciate any help you guys may have.

EDIT: I'm getting a 400 error now, which I think is the mediaBodyRequired error. Which im puzzled about as I'm passing through the file for upload. Any thoughts?