How to access file from aws s3 bucket?

How to access file from aws s3 bucket after upload the image to s3 bucket. When i am getting the image it shown access denied error.

<Error>
<Code>AccessDenied</Code>
<Message>Access Denied</Message>
<RequestId>xxxxx</RequestId>
<HostId>xxxxx</HostId>
</Error>

Controller Code is

$sharedConfig = [
                 'region' => Config::get('filesystems.disks.s3.region'),
                 'version' => 'latest',
                 "Effect" => "Allow",
                 'credentials' => [
                   'key' => 'xxxx',
                   'secret' => 'xxxx'
                  ]
                ];
               $sdk = new \Aws\Sdk($sharedConfig);
               $s3 = $sdk->createS3();
               $res = $s3->putObject([
               'Key' => $fileName, // This will overwrite any other files with same name
               'SourceFile' => $filePath,
               'Bucket' => 'bolttupload'
              ]);
              Storage::copy($res['ObjectURL'],$destinationPath.$fileName);
              echo $res['ObjectURL'];die;

via Chebli Mohamed