Add all files

app/Admin/Resources/InvoiceResource/Pages/CreateInvoice.php

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+<?php
+
+namespace App\Admin\Resources\InvoiceResource\Pages;
+
+use App\Admin\Resources\InvoiceResource;
+use Filament\Resources\Pages\CreateRecord;
+use Illuminate\Database\Eloquent\Model;
+
+class CreateInvoice extends CreateRecord
+{
+    protected static string $resource = InvoiceResource::class;
+
+    protected function handleRecordCreation(array $data): Model
+    {
+        $invoice = new (static::getModel());
+        $invoice->fill($data);
+        $invoice->send_create_email = $data['send_email'] ?? true;
+        $invoice->save();
+
+        return $invoice;
+    }
+}