fix unit tests as well as missing code

app/Services/ClassProgress/ClassProgressAttachmentService.php

@@ -5,6 +5,7 @@ namespace App\Services\ClassProgress;
 use App\Models\ClassProgressAttachment;
 use Illuminate\Http\UploadedFile;
 use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Facades\Storage;
 
 class ClassProgressAttachmentService
 {
@@ -48,6 +49,11 @@ class ClassProgressAttachmentService
         $candidates = [];
         if (str_starts_with($path, 'storage/')) {
             $relative = ltrim(substr($path, strlen('storage/')), '/');
+            $disk = (string) config('progress.attachments.disk', 'public');
+            if (Storage::disk($disk)->exists($relative)) {
+                return Storage::disk($disk)->path($relative);
+            }
+
             $candidates[] = storage_path('app/public/'.$relative);
         }