How to upload Large files using node.js and spsave module

I have implemented multiple file uploads using spsave. But whenever i try to upload larger file(5mb+) files are not getting uploaded.

const apiRequest = spsave(coreOptions, creds, fileOptions);
promiseArray.push(apiRequest);
Promise.all(promiseArray)
          .then((data) => {
            res.status(201).json({
              success: true,
              message: uploadSuccess,
            });
          })
          .catch((err) => {
            res.status(500).json({
              success: false,
              message: err.message,
            });
          });

and returning ns_error_connection_refused error.