How to receive text, files by the put method in laravel 5.6 (api restFULL)

I am developing APIS with laravel 5.6, I have a driver that receives images and text, by post everything works normally for me here I leave the code js

JS

 function registraPET(){

                var datos = new FormData();
                    jQuery.each(jQuery('.fileExcel')[0].files, function(i, file) {
                        datos.append('pet', file);
                    });
                    datos.append('fechaRecepcion','2018-10-10');
                    datos.append('idusuregistropet',1);
                    datos.append('codpetrecibida','asds');
                    datos.append('idcliente',1);
                    $.ajax({
                        url: 'http://127.0.0.1:8000/lineatiempopet',
                        type: 'post',
                        cache: false,
                        contentType: false,
                        processData: false,
                        data:datos,
                        success: function(response){
                            console.log(response)
                        },
                        error: function(jqXHR,status, errorThrown ){
                            console.log(jqXHR)
                        }
                    });
        }

PHP (LARAVEL 5.6) STORE FUNCTION / POST METHOD

public function store(Request $request)
    {
       /* $request->validate([
            'fechaRecepcion'=>'required|date',
            'idusuregistropet'=>'required|int',
            'codpetrecibida'=>'required|max:20',
            'fechavisitatecnica'=>'nullable|date',
            'urlpetrecibida'=>'nullable',
            'idusuvistatecnica'=>'nullable|int',
            'idcliente'=>'required|int',
            'observacion'=>'nullable|string|max:300',
            'idcot'=>'nullable|int',
            'fechaEjecucion'=>'nullable|date',
            'urlactaconformidad'=>'nullable|string',
            'urlordenCompra'=>'nullable|string',
            'fechareprogramacion'=>'nullable|date',
            'nrofactura'=>'nullable|string',
            'estado'=>'nullable|string|max1',
        ]);
        if($request->hasFile('pet')){
            $pet = $request->file('pet')->store('/public/documentacionPets/pets');
            $newLienaPET = new LineaTiempoPet();
            $newLienaPET->fechaRecepcion = $request->fechaRecepcion;
            $newLienaPET->idusuregistropet = $request->idusuregistropet;
            $newLienaPET->codpetrecibida = $request->codpetrecibida;
            $newLienaPET->fechavisitatecnica = $request->fechavisitatecnica;
            $newLienaPET->urlpetrecibida = Storage::url($pet);
            $newLienaPET->idusuvistatecnica = $request->idusuvistatecnica;
            $newLienaPET->idcliente = $request->idcliente;
            $newLienaPET->observacion = $request->observacion;
            $newLienaPET->idcot = $request->idcot;
            $newLienaPET->fechaEjecucion = $request->fechaEjecucion;
            $newLienaPET->urlactaconformidad = $request->urlactaconformidad;
            $newLienaPET->urlordenCompra = $request->urlordenCompra;
            $newLienaPET->fechareprogramacion = $request->fechareprogramacion;
            $newLienaPET->nrofactura = $request->nrofactura;
            $newLienaPET->estado = $request->estado;
            $newLienaPET->save();
        }else{
            return response()->json(['data'=>'Debe agregar una  PET','codigo'=>'400'],400);      
        }*/
        $linaTiempoPet = $request -> all(); 


        return response()->json(['data'=>$linaTiempoPet,'codigo'=>'200'],200);

    }

The problem is the function update / method put no data arrives

JS

Function updatePET(){
            var datos = new FormData();
            jQuery.each(jQuery('.fileExcel')[0].files, function(i, file) {
                        datos.append('pet', file);
                    });
                    datos.append('fechaRecepcion','2018-10-10');
                    datos.append('idusuregistropet',1);
                    datos.append('codpetrecibida','asds');
                    datos.append('idcliente',1);
                    $.ajax({
                        url: 'http://127.0.0.1:8000/lineatiempopet/1',
                        type: 'put',
                        cache: false,
                        contentType:false,
                        processData: false,
                        data:datos,
                        success: function(response){
                            console.log(response)
                        },
                        error: function(jqXHR,status, errorThrown ){
                            console.log(jqXHR)
                        }
                    });

        }

PHP (LARAVEL 5.6) UPDATE FUNCTION / PUT METHOD

  public function update(Request $request, LineaTiempoPet $lineatiempopet)
    {   
        //$pet = $request->file('pet')->store('/public/documentacionPets/pets');
        //$lineatiempopet->urlpetrecibida = $pet;
        $as = $request -> all();
        return response()->json(['data'=>$as,'codigo'=>'200'],200);
    }

As you can see in the controller I am returning everything that the view sends me, this I do to buy that as the data arrives, in the store function everything arrives normal the file is saved and everything goes fine but in the function update no data arrives THANK YOU IN ADVANCE TO THOSE WHO CAN HELP ME