implement uploading file

app/Http/Controllers/Chat/MessageAttachmentController.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Controllers\Chat;
+
+use App\Http\Controllers\Controller;
+use App\Models\Message;
+use Illuminate\Support\Facades\Gate;
+use Illuminate\Support\Facades\Storage;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+
+class MessageAttachmentController extends Controller
+{
+    public function __invoke(Message $message): StreamedResponse
+    {
+        $message->loadMissing('conversation');
+
+        Gate::authorize('view', $message->conversation);
+
+        $path = $message->attachmentPath();
+
+        abort_unless($message->isFile() && $path, 404);
+        abort_unless(Storage::disk($message->attachmentDisk())->exists($path), 404);
+
+        return Storage::disk($message->attachmentDisk())->download($path, $message->attachmentName());
+    }
+}