diff --git a/.env.local b/.env.local
new file mode 100644
index 0000000..a203d8b
--- /dev/null
+++ b/.env.local
@@ -0,0 +1,18 @@
+APP_ENV=development
+APP_DEBUG=true
+
+FILE_STORAGE_DRIVER=local
+FILE_STORAGE_LOCAL_PATH=storage/
+
+DATABASE_DRIVER=sqlite
+# DATABASE_HOST=localhost
+# DATABASE_NAME=myapp
+# DATABASE_CHARSET=utf8mb4
+# DATABASE_USERNAME=root
+# DATABASE_PASSWORD=
+
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# AWS_DEFAULT_REGION=
+# AWS_DEFAULT_ENDPOINT=
+# AWS_BUCKET=
diff --git a/Core/Container.php b/Core/Container.php
index f8c9114..8bae0e6 100755
--- a/Core/Container.php
+++ b/Core/Container.php
@@ -2,6 +2,9 @@
 
 namespace Core;
 
+use function array_key_exists;
+use function call_user_func;
+
 class Container
 {
   public function bind(string $key, callable $resolver): void
@@ -9,7 +12,7 @@ public function bind(string $key, callable $resolver): void
     $this->bindings[$key] = $resolver;
   }
 
-  public function resolve(string $key): mixed
+  public function resolve(string $key): callable
   {
     if (!array_key_exists($key, $this->bindings)) {
       throw new \Exception("No matching binding found for '{$key}'");
diff --git a/Core/FileStorage.php b/Core/FileStorage.php
new file mode 100644
index 0000000..2f2a747
--- /dev/null
+++ b/Core/FileStorage.php
@@ -0,0 +1,9 @@
+<?php declare(strict_types=1);
+
+namespace Core;
+
+interface FileStorage
+{
+  public function put(string $path, string $content): bool;
+  public function get(string $path): ?string;
+}
diff --git a/Core/FileStorageDriver.php b/Core/FileStorageDriver.php
new file mode 100644
index 0000000..07eb9f3
--- /dev/null
+++ b/Core/FileStorageDriver.php
@@ -0,0 +1,9 @@
+<?php declare(strict_types=1);
+
+namespace Core;
+
+enum FileStorageDriver: string
+{
+  case LOCAL = 'local';
+  case S3 = 's3';
+}
diff --git a/Core/LocalStorage.php b/Core/LocalStorage.php
new file mode 100644
index 0000000..91f4bde
--- /dev/null
+++ b/Core/LocalStorage.php
@@ -0,0 +1,40 @@
+<?php declare(strict_types=1);
+
+namespace Core;
+
+class LocalStorage implements FileStorage
+{
+  public function __construct()
+  {
+    $this->basePath = __DIR__ . "/../{$_ENV['FILE_STORAGE_LOCAL_PATH']}";
+  }
+
+  public function put(string $path, string $content): bool
+  {
+    $savePath = "{$this->basePath}/{$path}";
+
+    if (!is_dir(dirname($savePath))) {
+      mkdir(dirname($savePath), 0777, true);
+    }
+
+    file_put_contents($savePath, $content);
+    return true;
+  }
+
+  public function get(string $path): ?string
+  {
+    $fullPath = "{$this->basePath}$path";
+
+    if (!file_exists($fullPath)) {
+      throw new \Exception("File not found: {$path}");
+    }
+
+    if (!is_readable($fullPath)) {
+      throw new \Exception("File not readable: {$path}");
+    }
+
+    return file_get_contents($fullPath);
+  }
+
+  protected string $basePath;
+}
diff --git a/Core/S3Storage.php b/Core/S3Storage.php
new file mode 100644
index 0000000..555a64f
--- /dev/null
+++ b/Core/S3Storage.php
@@ -0,0 +1,41 @@
+<?php declare(strict_types=1);
+
+namespace Core;
+
+use Aws\S3\S3Client;
+use Aws\S3\Exception\S3Exception;
+
+class S3Storage implements FileStorage
+{
+  public function __construct(protected S3Client $client, protected string $bucket)
+  {
+  }
+
+  public function put(string $path, string $content): bool
+  {
+    try {
+      $this->client->putObject([
+        'Bucket' => $this->bucket,
+        'Key' => $path,
+        'Body' => $content,
+      ]);
+      return true;
+    } catch (S3Exception $e) {
+      echo "Failed to upload file to S3: {$e->getMessage()}\n";
+      return false;
+    }
+  }
+
+  public function get(string $path): ?string
+  {
+    try {
+      $result = $this->client->getObject([
+        'Bucket' => $this->bucket,
+        'Key' => $path,
+      ]);
+      return $result->get('Body')->getContents();
+    } catch (S3Exception $e) {
+      throw new \Exception("Failed to get file from S3: {$e->getMessage()}");
+    }
+  }
+}
diff --git a/Core/Storage.php b/Core/Storage.php
new file mode 100644
index 0000000..3490da3
--- /dev/null
+++ b/Core/Storage.php
@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+namespace Core;
+
+use Aws\S3\S3Client;
+use Exception;
+
+class Storage
+{
+  /**
+   * @throws Exception
+   */
+  public static function resolve(): FileStorage
+  {
+    $driver = FileStorageDriver::from($_ENV['FILE_STORAGE_DRIVER']);
+
+    if ($driver === FileStorageDriver::LOCAL) {
+      return new LocalStorage();
+    } else if ($driver === FileStorageDriver::S3) {
+      $client = new S3Client([
+        'version' => 'latest',
+        'region' => $_ENV['AWS_DEFAULT_REGION'],
+        'endpoint' => $_ENV['AWS_DEFAULT_ENDPOINT'],
+        'credentials' => [
+          'key' => $_ENV['AWS_ACCESS_KEY_ID'],
+          'secret' => $_ENV['AWS_SECRET_ACCESS_KEY']
+        ]
+      ]);
+
+      return new S3Storage($client, $_ENV['AWS_BUCKET']);
+    }
+
+    throw new Exception('Invalid storage method.');
+  }
+}
diff --git a/README.md b/README.md
index 5f19717..34dbad3 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,9 @@ A minimal, dependency-light PHP microframework skeleton. This repository provide
 - [App container API](#app-container-api)
 - [Accessing the Database](#accessing-the-database)
 - [Routes and Router](#routes-and-router)
+- [Environment variables](#environment-variables)
 - [Configuration](#configuration)
+- [File Storage API](#file-storage-api)
 - [Testing](#testing)
 - [Contributing](#contributing)
 - [License](#license)
@@ -22,10 +24,15 @@ A minimal, dependency-light PHP microframework skeleton. This repository provide
 Top-level files and folders in the repository:
 
 - .gitignore
-- Core/ — core framework classes (App, Container, Database, Router, Validator, Session, Response, Authenticator, exceptions, helpers)
+- Core/ — core framework classes (App, Container, Database, Router, Validator, Session, Response, Authenticator, exceptions, helpers, etc...)
   - Core/App.php
   - Core/Container.php
   - Core/Database.php
+  - Core/FileStorage.php - a thin facade / helper that delegates to the configured driver.
+  - Core/FileStorageDriver.php - the driver interface (contract) every storage adapter must implement.
+  - Core/LocalStorage.php - local filesystem implementation of the driver.
+  - Core/S3Storage.php - an Amazon S3 implementation that uses `aws/aws-sdk-php`.
+  - Core/Storage.php - an optional factory that decides which driver to instantiate based on `FILE_STORAGE_DRIVER` value.
   - Core/Router.php
   - Core/Validator.php
   - Core/Session.php
@@ -35,17 +42,17 @@ Top-level files and folders in the repository:
   - Core/functions.php
   - Core/Middleware/ (middleware hooks)
 - Http/ — HTTP layer (request/response helpers, middleware, adapters)
-- bootstrap.php — bootstraps the Container and binds Database into it
+- bootstrap.php - bootstraps the Container and binds Database into it
 - composer.json
-- config.php — returns an array with the configuration for db and api keys (do not push into prod)
-- public/ — document root / front controller (not populated in the repo root)
-- routes.php — application route declarations
-- tests/ — test cases
-- views/ — templates
+- config.php - returns an array with the configuration for db and api keys (do not push into prod)
+- public/ - document root / front controller (not populated in the repo root)
+- routes.php - application route declarations
+- tests/ - test cases
+- views/ - templates
 
 ## Requirements
 
-- PHP 8.0+ (check composer.json for any platform constraints)
+- PHP 8.4+ (check composer.json for any platform constraints)
 - Composer for autoloading and installing dependencies
 - Typical PHP extensions (json, mbstring, etc.)
 
@@ -123,6 +130,39 @@ Adjust usage based on the public methods exposed by Core\Database (see Core/Data
 
 Place route definitions in routes.php and ensure your front controller requires it after bootstrapping.
 
+## Environment variables
+
+This project now uses `vlucas/phpdotenv` to manage environment variables. Add a `.env` file to the project root to configure secrets and environment-specific settings.
+
+Here's `.env.local` file which is a general template that after creating your project, do:
+
+```bash
+cp .env.local .env
+```
+
+To make a second clone of it, then change it to your projects needs:
+
+```.env
+APP_ENV=development
+APP_DEBUG=true
+
+FILE_STORAGE_DRIVER=local
+FILE_STORAGE_LOCAL_PATH=storage/
+
+DATABASE_DRIVER=sqlite
+# DATABASE_HOST=localhost
+# DATABASE_NAME=myapp
+# DATABASE_CHARSET=utf8mb4
+# DATABASE_USERNAME=root
+# DATABASE_PASSWORD=
+
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# AWS_DEFAULT_REGION=
+# AWS_DEFAULT_ENDPOINT=
+# AWS_BUCKET=
+```
+
 ## Configuration
 
 config.php should return an associative array. bootstrap.php expects the following structure at minimum:
@@ -139,6 +179,33 @@ return [
 
 Edit config.php to match the connection options required by Core\Database.
 
+## File Storage API
+
+The API is intentionally simple. Common methods available on the driver and facade:
+
+- put(string $path, string $contents): bool
+- get(string $path): ?string
+
+Snippet of usage:
+
+```php
+// File Upload Snippet using the newly added file storage api.
+\Core\Storage::resolve()->put('file.txt', 'Hello, World!');
+```
+
+To get files:
+
+```php
+$savePath = __DIR__ . '/storage/hello-s3.txt';
+
+if (!is_dir(dirname($savePath))) {
+  mkdir(dirname($savePath), 0777, true);
+}
+
+file_put_contents($savePath, $s3File);
+echo 'Done!';
+```
+
 ## Testing
 
 write you tests in /tests/Unit for single unit tests, or in /tests/Feature for feature tests, then run tests with:
diff --git a/composer.json b/composer.json
index 7659cfa..5ce4bd4 100755
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,9 @@
   "description": "very simple and minimum Micro Framework built with PHP.",
   "license": "MIT",
   "require": {
-    "illuminate/collections": "^12.36"
+    "illuminate/collections": "^12.36",
+    "vlucas/phpdotenv": "^5.6",
+    "aws/aws-sdk-php": "^3.369"
   },
   "autoload": {
     "psr-4": {
diff --git a/config.php b/config.php
index 4c7c99d..8ff6992 100755
--- a/config.php
+++ b/config.php
@@ -2,8 +2,8 @@
 
 return [
   'database' => [
-    'host'      => 'localhost',
-    'dbname'    => 'myapp',
-    'charset'   => 'utf8mb4'
+    'host' => $_ENV['DATABASE_HOST'],
+    'dbname' => $_ENV['DATABASE_NAME'],
+    'charset' => $_ENV['DATABASE_CHARSET']
   ]
 ];
diff --git a/public/index.php b/public/index.php
index 2dd930f..b94f7b0 100755
--- a/public/index.php
+++ b/public/index.php
@@ -6,6 +6,17 @@
 const BASE_PATH = __DIR__ . '/../';
 require BASE_PATH . 'vendor/autoload.php';
 
+use Dotenv\Dotenv;
+
+$dotenv = Dotenv::createImmutable(__DIR__);
+$dotenv->load();
+
+//* File Upload Snippet using the newly added file storage api.
+/**
+ * \Core\Storage::resolve()->put('hello.txt', 'Hello, World!');
+ * echo 'Done!';
+ */
+
 session_start();
 
 require BASE_PATH . 'Core/functions.php';