Issue in uploading image file on server using postman in laravel 5.3?

I am using intervention for file resize functionality and for file uploading. In controller I am just checking hasFile() or not. so, everytime I got "no" in response even if I am sending it properly using postman. what can be the issue ?

my route

Route::post('contact/image/upload',['as'=>'intervention.postresizeimage','uses'=>'contactController@upload_image']);

code in controller

public function upload_image(Request $request){

      if((preg_match("/^[789]\d{9}$/", $request->header('UID')))){
        if($request->hasFile('photo'))
          return "yes";
        else
          return "no";


        $photo = $request->file('photo');
        $imagename = time().'.'.$photo->getClientOriginalExtension(); 

        $destinationPath_thumb = storage_path('images/thumbnail_images');
        $thumb_img = Image::make($photo->getRealPath())->resize(100, 100);
        $thumb_img->save($destinationPath_thumb.'/'.$imagename,80);

        $destinationPath_medium = storage_path('images/medium_images');
        $medium_img = Image::make($photo->getRealPath())->resize(500, 500);
        $medium_img->save($destinationPath_medium.'/'.$imagename,80);

        $destinationPath_original = storage_path('images/original_images');
        $photo->move($destinationPath_original, $imagename);

        $user = \App\User::select(['inst_id'])->where('mobile','=',$request->header('UID'))->first();

        $update_img = \App\Contact::where([['id','=',$request->ID],['inst_id','=',$user->inst_id]])->update(['image'=>$imagename]);

        if($update_img)
          $response = response()->json(['data'=>[], 'error'=>0,  'error_msg'=>'', 'message'=>'Profile updated']);
        else
          $response = response()->json(['data'=>[], 'error'=>1,  'error_msg'=>'some went wrong', 'message'=>'Please try again']);
      }
      else
         $response = response()->json(['data'=>[], 'error'=>1,  'error_msg'=>'wrong mobile in UID header','message'=>'wrong mobile no. in header']);

    return  $response;

  }

via Chebli Mohamed