Using Multer and Express to upload and display files

try:

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, '/where/ever/the/upload/dir/is')
  },
  filename: function (req, file, cb) {
    cb(null, file.orignalname)
  }
})

var upload = multer({ storage: storage })

Instead of:

var upload = multer({ dest: 'uploads/' })

Requesting the file:
With the proper permissions set on the file/or directory your server should be able to request it fine, remember to explicitly write the file name with an extension if you aren't doing anything fancy after the file is written ;)

If you want more control over your uploads, you'll want to use the storage option instead of dest. Multer ships with storage engines DiskStorage and MemoryStorage; More engines are available from third parties. --The Horse
(ref: github: expressjs/multer)

Note: Multer will not append any file extension for you, your function should return a filename complete with an file extension