Tests passed using Mock

Server/Services/AttachmentsService.cs

@@ -143,10 +143,10 @@ public class AttachmentsService : IAttachmentsService
             if (!Directory.Exists(checkDirectory))
                 continue;
             files.AddRange(Directory.GetFiles(checkDirectory));
-            if (files.Any())
+            if (files.Count != 0)
                 break;
         }
-        result = !files.Any() ? null : files.First();
+        result = files.Count == 0 ? null : files.First();
         return result;
     }