Additional/app/Mail/InvoiceEmail.php

<?php

namespace App\Mail;

use App\Models\Order;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Mail\Mailables\Content;
use Illuminate\Mail\Mailables\Envelope;
use Illuminate\Mail\Mailables\Attachment;
use Illuminate\Queue\SerializesModels;

class InvoiceEmail extends Mailable implements ShouldQueue
{
    use Queueable, SerializesModels;

    /**
     * Create a new message instance.
     */
    public function __construct(
        public Order $order,
        public string $invoicePath
    ) {}

    /**
     * Get the message envelope.
     */
    public function envelope(): Envelope
    {
        return new Envelope(
            subject: 'Invoice #' . $this->order->order_number . ' from Additional Design',
        );
    }

    /**
     * Get the message content definition.
     */
    public function content(): Content
    {
        return new Content(
            view: 'emails.invoice',
            with: [
                'order' => $this->order,
                'invoiceNumber' => $this->order->order_number,
            ],
        );
    }

    /**
     * Get the attachments for the message.
     *
     * @return array<int, Attachment>
     */
    public function attachments(): array
    {
        return [
            Attachment::fromPath($this->invoicePath)
                ->as('Invoice-' . $this->order->order_number . '.pdf')
                ->withMime('application/pdf'),
        ];
    }
}