[Bug] Mutator don't triggered with extra pivot when save file in subfield

[Matthieu24]

Bug report

Hi,

I tried to save files in the pivot table, but when I saved, I got this output in the database: [{}].
My setDiplomaDocumentAttribute() function does not seem to be used.

What I did

CRUD :

 'subfields' => [ 
                            [
                                'name'      => 'diploma_document',
                                'label'     => 'Fichiers',
                                'type'      => 'upload_multiple',
                                'upload'    => true,
                                'wrapper' => [
                                    'class' => 'form-group col-md-9',
                                ],
                            ],
                        ],

Model:

public function diplomas()
    {
        return $this->belongsToMany(Diploma::class, 'user_diploma','user_id','diploma_id')->withPivot('diploma_document');
    }   
    
public function setDiplomaDocumentAttribute($value)
    {
        $attribute_name = "diploma_document";
        $disk = "local";
        $destination_path = "diploma_documents";

        $this->uploadMultipleDiplomasToDisk($value, $attribute_name, $disk, $destination_path);
    }

What I expected to happen

Files are saved

What happened

Files is not saved and the value [{}] appears in the database.

What I've already tried to fix it

I tried to call the function in CRUD but I get a [null] value in the database.

'subfields' => [ 
                            [
                                'name'      => 'diploma_document',
                                'label'     => 'Fichiers',
                                'type'      => 'upload_multiple',
                                'upload'    => true,
                                'function'  => function($entry){
                                    $entry->setDiplomaDocumentAttribute();
                                },
                                'wrapper' => [
                                    'class' => 'form-group col-md-9',
                                ],
                            ],
                        ],

Backpack, Laravel, PHP, DB version

PHP VERSION:

PHP 8.1.3 (cli) (built: Feb 16 2022 08:20:53) (NTS Visual C++ 2019 x64)
Copyright (c) The PHP Group
Zend Engine v4.1.3, Copyright (c) Zend Technologies

LARAVEL VERSION:

v9.45.1@faeb20d3fc61b69790068161ab42bcf2d5faccbc

BACKPACK VERSION:

5.4.11@ffbadcdb6478822646600b2cd763490caa927155

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[Matthieu24]

I just saw that it is the same problem as the repo #4676 and 4141 so I close