imageUpload in movieclip

where is the problem Attached file for my project

https://drive.google.com/file/d/1wFPRy-hXRpoHvqFV9CtCQFfjlcfn5M4a/view?usp=sharing

    // Grabbing Elements and Storing in Variables
const defaultFile = document.getElementById("default-file");
const customBtn = document.getElementById("custom-btn");
const customSpace = document.getElementById("custom-space");


this.customBtn.addEventListener("click", fl_MouseClickHandler.bind(this));
function fl_MouseClickHandler() {
    this.defaultFile();
}


this.defaultFile.addEventListener("change", defaultFile1.bind(this));
function defaultFile1() {
    if (defaultFile.value) {
        customSpace.innerHTML =
            this.defaultFile.value.match(/[\/\\]([\w\d\s\.\-\(\)]+)$/)[1];
    } else {
        this.customSpace.innerHTML = "No File, Selected!";
    }

    const files = defaultFile.files[0];


    if (files) {
        const fileReader = new FileReader();
}

    this.fileReader.addEventListener("load", function () {
        this.preview_img.setAttribute("src", this.result);
        this.console.log(this.result);
    });
    this.fileReader.readAsDataURL(files);
}