first upload all files

Modules/Category/Providers/CategoryServiceProvider.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Modules\Category\Providers;
+
+use Modules\Support\Traits\AddsAsset;
+use Illuminate\Support\ServiceProvider;
+
+class CategoryServiceProvider extends ServiceProvider
+{
+    use AddsAsset;
+
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        $this->addAdminAssets('admin.categories.index', [
+            'admin.category.css', 'admin.jstree.js', 'admin.category.js',
+            'admin.media.css', 'admin.media.js',
+        ]);
+    }
+}