Espero que esto ayude, solo repite tus archivos descomprimidos y envía cada uno

 var AWS = require('aws-sdk'); var fs = require('fs'); module.exports.UploadFile = function(credentials, BucketPath, folder, Region, fname, s3url, req, res, callback) { // AWS Region AWS.config.region = Region; // AWS credentials AWS.config.update(credentials); // create read stream for file var filestream = fs.createReadStream(fname); //create an instance of s3 var s3 = new AWS.S3({params: {Bucket: BucketPath}}); // read file fs.readFile(fname, function (err, data) { //upload to s3 s3.upload({ Key: folder + fname , Body: filestream // change contentType as needed , ACL: 'public-read','ContentType' : 'application/pdf'} , function(err,result) { if(err) throw err; // check if the file uploaded or not s3.getObject({ Key: folder + fname }, function (error, data) { if (error != null) { } else { // remove file from local if needed fs.unlink(fname, function (err) { if (err) { console.log(err); } callback("", data); }); } }); }); }); };