My javascript is the following

function uploadvideo(){
    var input = document.getElementById('myFile')

    let video = new FormData()
    video.append('file', input.files[0])
    video.append("", "\\")

    fetch("https://api.cloudflare.com/client/v4/accounts/{AccountID}/stream", {
        video,
        headers: {
            Authorization: "Bearer {Token}",
            "Content-Type": "multipart/form-data"
        },
        method: "POST"
    })
        .then(response => response.json())
        .then(data => console.log(data));
}

When the function is called, Cloudflare returns the following

main.js:17 {result: null, success: false, errors: Array(1), messages: null}errors: Array(1)0: code: 10004message: "Decoding Error"[[Prototype]]: Objectlength: 1[[Prototype]]: Array(0)messages: nullresult: nullsuccess: false[[Prototype]]: Object