Laravel 5.0:CSV created using fopen() and Upload on AWS S3 Bucket Using Storage

I am working on two things:

1. Creating the CSV file using fopen() and inserting the data from mysql and Close the File.
2. Now, need to upload that created file into AWS S3 bucket directly.

Now, I am able to created the CSV file, but unable to upload the file into AWS S3 bucket.

Laravel PHP Code:

public function download() {

        $headers = array(
            "Content-type" => "text/csv",
            "Content-Disposition" => "attachment; filename=auditsystem.csv",
            "Pragma" => "no-cache",
            "Cache-Control" => "must-revalidate, post-check=0, pre-check=0",
            "Expires" => "0"
        );
        $columns = array(
            'S.no',
            'State Name',
            'State Code'
        );
        $audit_params = DB::select(DB::raw("select * from table_state_codes"));
        $callback = function() use ($audit_params, $columns) {
         $file_name="auditsystem.csv";
            $file = fopen('php://output', 'w+');
            fputcsv($file, $columns);
            foreach ($audit_params as $rowOrders) {
                fputcsv($file, [
                    $rowOrders->id,
                    $rowOrders->state_name,
                    $rowOrders->state_code,
                ]);
            }
            fclose($file);
            Storage::disk('s3')->put('uploads/' . $file_name, file_get_contents($file), 'public');

        };

        return response()->stream($callback, 200, $headers);
 }

I am getting this error,

I am unable to Upload the File into AWS S3 bucket. Also, File format is kept w+, so that I can write as well as read also.

Please let me know where I am going wrong.Eagerly waiting for your opinions.

Thanks in advance.

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