first upload all files

Modules/Product/Config/assets.php

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+<?php
+
+return [
+    /*
+    |--------------------------------------------------------------------------
+    | Define which assets will be available through the asset manager
+    |--------------------------------------------------------------------------
+    | These assets are registered on the asset manager
+    */
+    'all_assets' => [
+        'admin.product.js' => ['module' => 'product:admin/js/product.js'],
+        'admin.product.css' => ['module' => 'product:admin/css/product.css'],
+    ],
+
+    /*
+    |--------------------------------------------------------------------------
+    | Define which default assets will always be included in your pages
+    | through the asset pipeline
+    |--------------------------------------------------------------------------
+    */
+    'required_assets' => [],
+];

Modules/Product/Config/config.php

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+<?php
+
+return [
+    'recently_viewed' => [
+        /*
+        * ---------------------------------------------------------------
+        * formatting
+        * ---------------------------------------------------------------
+        *
+        * the formatting of shopping cart values
+        */
+        'format_numbers' => env('SHOPPING_FORMAT_VALUES', false),
+
+        'decimals' => env('SHOPPING_DECIMALS', 0),
+
+        'dec_point' => env('SHOPPING_DEC_POINT', '.'),
+
+        'thousands_sep' => env('SHOPPING_THOUSANDS_SEP', ','),
+
+        /*
+        * ---------------------------------------------------------------
+        * persistence
+        * ---------------------------------------------------------------
+        *
+        * the configuration for persisting cart
+        */
+        'storage' => null,
+
+        /*
+        * ---------------------------------------------------------------
+        * events
+        * ---------------------------------------------------------------
+        *
+        * the configuration for cart events
+        */
+        'events' => null,
+    ],
+];

Modules/Product/Config/permissions.php

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+<?php
+
+return [
+    'admin.products' => [
+        'index' => 'product::permissions.index',
+        'create' => 'product::permissions.create',
+        'edit' => 'product::permissions.edit',
+        'destroy' => 'product::permissions.destroy',
+    ],
+];