How to pass data to Laravel Mailer

I have the following Mailable extension in Laravel

class QualityFinal extends Mailable
{
    use Queueable, SerializesModels;

    public $randie;
    public $report;

    public function __construct($randie)
    {
        $this->randie = $randie;
        $this->report = [];
    }

    public function build()
    {
        $this->report = QrfQualityForm::whereRandie($this->randie)->first();
        $files = Storage::disk('spaces')->files("qrf/{$this->randie}");

        $filename = Str::slug($this->report['employee'], '_') . '_' . Carbon::now()->format('Y-m-d') . '_Quality_Form.pdf';

        $this->report->form_url = $filename;
        $this->report->save();

        if($this->report) {
            $path = "qrf/{$this->randie}/{$filename}";
            $pdf = PDF::loadView('forms.quality_final', $this->report);
            Storage::disk('spaces')
                ->put($path, $pdf->output());

            $email = $this->view('emails.quality_final', $this->report)
                ->subject($this->report['reporter'] . ' Quality Action Form Submission');

            foreach ($files as $file) {
                $email->attachFromStorageDisk('spaces', $file);
            } // end for

            return $email;
        } else {
            return 'Report not found';
        } // end if
    }
}

However it gives me the exception

Undefined variable: report

I have declared the variable as public so the docs say the variable should be available to the view. Am I doing something wrong?

via Chebli Mohamed