I am creating an employee payroll application where i want to upload and download xlsx file in records section. Controller works fine. Postman gives response as file uploaded successfully but the file is not uploaded in public/docs directory. Am i doing something wrong while serving static directory.

Static directory serving code.

app.use(express.static(path.join(process.cwd(), 'public')));

Router to uploading file

router.post('/', protect, upload.single("file"), fileUpload)
router.get('/download', fileDownload)

Controller for uploading file

const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        if(!fs.existsSync(directory)){
            fs.mkdirSync(directory)
            console.log("Running 123", directory);
            cb(null, directory)
        }else{
            console.log("Directory already exists", directory);
            cb(null, directory)
        }
    },
    filename: (req, file, cb) => {
        cb(null, Date.now() + "-" + file.originalname)
    }
})

const upload = multer({storage, fileFilter: (req, file, callback) => {
    if(['xls', 'xlsx', 'NUMBERS'].indexOf(file.originalname.split('.')[file.originalname.split('.').length-1]) === -1){
        return callback(new Error('Wrong extension type'));
    }
    callback(null, true);
}})

const fileUpload = function(req, res) {
    let recordPath = path.join(process.cwd(),'public/docs/' + req.file.filename)
    importToDb(recordPath);
    fs.unlinkSync(recordPath);
    res.json({'msg': 'Employee record uploaded and successfully imported', 'file': req.file});
};

const fileDownload = function(req, res) {
    let template = path.join(process.cwd(), '/public/docs/Employee_Record_Template.xlsx');
    res.download(template);
};

Directory Structure is

payroll
-bin
-public
    -docs
    -emailTemplates
    -images
    -javascripts
    -stylesheets
    -fonts
-src
    -config
    -controllers
        -api
    -middlewares
    -models
    -routes
app.js