Hello everyone,

So I am trying to make a playlist maker, and I'm trying to upload mp3, but when I go to Music.php and add public $attachOne = [ 'melody' => 'System/Models/File' ]; it doesn't work. I checked all the problems, the File.php is in modules/System/Models It also says this D:\XAMPP\htdocs\myoctober\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Concerns\HasRelationships.php line 506 and I cannot understand what the problem is. I'm running PHP 7.1 and everything went well, it is on localhost XAMPP.

I really need some help, Thank you