Issues creating record with multi-file upload

FileUpload::make('attachments')
    ->directory('transaction_attachments')
    ->multiple()
    ->columnSpanFull(),

  6 => array:2 [
    0 => "transaction_attachments/A9w9noTN1feXWe8gWpLOt0qD25fSmv-metad291dGVyX3Zhbl9tYXJydW0ucGRm-.pdf"
    1 => "transaction_attachments/uGq6pUXNVWwQtoTk5UxcnZelzcPJnB-metaTWJvIE1lZGV3ZXJrZXIgSUNUIC0gRU4ucGRm-.pdf"
  ]

    protected $guarded = [];

    protected $cast = [
        'type' => TransactionTypes::class,
        'attachments' => 'array',
    ];

    protected $dates = [
        'paid_at',
    ];