lala.js

const queryParams = "...........&type=ATTACHMENT&filename=" + fileName;

        var xhttp = new XMLHttpRequest();

        xhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                // Action to be performed when the document is read;
            }
        };

        xhttp.open("PUT", "https://www.mediktor.com/dev/uploads/File.Upload?" + queryParams, true);
        xhttp.setRequestHeader("Authorization", "Basic " + this.authCode);
        xhttp.setRequestHeader("Content-Type", "application/octet-stream");



        xhttp.send(fileContent);