first upload all files

Modules/Product/Resources/assets/admin/js/Download.js

@@ -0,0 +1,32 @@
+export default class {
+    constructor(download) {
+        this.downloadHtml = this.getDownloadHtml(download);
+    }
+
+    getDownloadHtml(download) {
+        let template = _.template($('#product-download-template').html());
+
+        return $(template(download));
+    }
+
+    render() {
+        this.attachEventListeners();
+
+        return this.downloadHtml;
+    }
+
+    attachEventListeners() {
+        this.downloadHtml.find('.delete-row').on('click', () => {
+            this.downloadHtml.remove();
+        });
+
+        this.downloadHtml.find('.btn-choose-file').on('click', () => {
+            let picker = new MediaPicker();
+
+            picker.on('select', (file) => {
+                this.downloadHtml.find('.download-name').val(file.filename);
+                this.downloadHtml.find('.download-file').val(file.id);
+            });
+        });
+    }
+}