Could you point why an Excell file read at browser (js) is obtained at PHP code as a tmp file?

Hi Experts

Could you point why an Excell file read at browser (js) is obtained at PHP code as a tmp file?

Accordingly with:

The JS code called (that produces the console showed above):

 

User.prototype.subirLote = function() {
 // Called to upload the file
   console.log('XXXX');
  $("#arquivoLote").trigger("click");
  
  arquivo = $("#arquivoLote").val();
  
// The name is empty
  console.log('Y ' + arquivo);

};

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When this PHP code is called:

<? 
//------------------------------------------------------------
    public function subirLote(Request $request){
//------------------------------------------------------------  
      
      $arquivo=$request->file('arquivoLote');
	  
	  
*--- AT THIS POINT THE FILE IS RECEIVED AS: C:\xampp\tmp\php6669.tmp (OR SOMETHING LIKE)
file_put_contents('debug.log', 'Arquivo = '. $arquivo.PHP_EOL , FILE_APPEND);
*-----------------------------------------------------------------------------

      Config::set('excel.import.heading', 'slugged_with_count');
      Config::set('excel.import.startRow', 1);

      try{

        $arquivoUrl = AzureStorage::saveFile($arquivo,'arquivos');
    
        $planilha = Excel::selectSheets('Participantes')->load($arquivo)->toArray();
      
        $validacao = $this->validarArquivo($planilha);
        

        if(!$validacao["valido"])
		{  
   
          return response()->json(new Resultado(false,"",$validacao));
        }
        
        $this->processarLote($planilha);
    
        $saida = array (
          "mensagem"=>"<div class='alert alert-success text-center'><strong>Sucesso:</strong> Arquivo processado com sucesso!</div>",
          "valido"=>true
        );

      } catch (\Exception $e) {
        Debugbar::info($e);
        Log::error($e);
        

        $saida = array (
          "mensagem"=>"<div class='alert alert-warning text-center'><strong>Informação:</strong> 002 Arquivo de participantes com formato inválido.<br />Por favor, verifique-o antes de continuar</div>",
          "valido"=>false
        );
      }
      return response()->json(new Resultado(false,"",$saida));
    }
 ?>

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The code is under Laravel with Excel Libraries, I don't know if this error is related with this fact.

Thanks in advance