Problem with two private disks filesystem

Hi, I'm trying to use two private disks (one for uploading attachments to the storage/app/attachments folder and the other for uploading avatar users in storage/app/avatars folder).

This is my config:

'disks' => [

    'attachments' => [
        'driver' => 'local',
        'root' => storage_path('app/attachments'),
        'visibility' => 'private'
    ],

    'avatars' => [
        'driver' => 'local',
        'root' => storage_path('app/avatars'),
        //'url' => env('APP_URL').'/storage',
        'visibility' => 'private'
    ],

    'public' => [
        'driver' => 'local',
        'root' => storage_path('app/public'),
        'url' => env('APP_URL').'/storage',
        'visibility' => 'public',
    ],

    's3' => [
        'driver' => 's3',
        'key' => env('AWS_KEY'),
        'secret' => env('AWS_SECRET'),
        'region' => env('AWS_REGION'),
        'bucket' => env('AWS_BUCKET'),
    ],
];

When I use the avatars disk like this:

$path = Storage::disk('avatars')->getDriver()->getAdapter()->getPathPrefix();
        $file->move(
         $path, $filename
        );

the file is uploaded correctly (inside avatars folder), but when I need to get the URL something is going wrong because I get this type of url: '/storage/avatar_1.png' when I use this:

$avatarUrl = Storage::disk('avatars')->url($avatarObject[0]->filename);

the avatar can't not found. If I copy the image to the attachments folder then the avatar is shown in the view correctly.

I'm afraid I'm not understanding how this (the filesystem) goes, I guess I need to get the correct URL or configure it inside filesystems.php so any comment or help will be welcome...