axios
        .post(url, body, {
          headers: {
            "Content-Type": "application/json; charset=utf-8",
            Authorization: "Bearer " + thisToken
          },
          responseType: "arraybuffer",
          validateStatus: function(status) {
            return status < 500;
          }
        })
        .then(response => {
          let fileName = data.fileName;
          let fileSystem = cordova.file.externalApplicationStorageDirectory;
          const blob =  new Blob([response.data], {
              type: "application/octet-stream"
              });
          window.resolveLocalFileSystemURL(fileSystem, function (dir) {
            dir.getFile(fileName, {create: true}, function (file) {
              file.createWriter(function (fileWriter) {
                fileWriter.write(blob);
            });
          });          
        });  
      });