Hocam kodlarım bu şekilde

function showFiles() {
  [...this.files].map((element) => {
    let item = document.createElement("div");
    item.className = "upload-item";
    item.innerHTML = `
      <div class="upload-content">
              <div class="item-type">
                <img src="./file_icons/${fileIcon(element.name)}.png" alt="" />
              </div>
              <div class="item-name">${element.name}</div>
            </div>
            <div class="upload-status"></div>`;

    uploadBody.appendChild(item);

    files.push({
      file: element,
      el: item,
    });
  });
}