Add all files

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

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+<?php
+
+namespace App\Admin\Resources\InvoiceResource\Pages;
+
+use App\Admin\Resources\InvoiceResource;
+use App\Classes\PDF;
+use App\Models\Invoice;
+use Filament\Actions;
+use Filament\Resources\Pages\EditRecord;
+
+class EditInvoice extends EditRecord
+{
+    protected static string $resource = InvoiceResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make(),
+            Actions\Action::make('pdf')
+                ->label('Download PDF')
+                ->action(function (Invoice $invoice) {
+                    return response()->streamDownload(function () use ($invoice) {
+                        echo PDF::generateInvoice($invoice)->stream();
+                    }, 'invoice-' . $invoice->number . '.pdf');
+                }),
+        ];
+    }
+}