How to upload multiple Photos with multer and node modules?

(a cautionary note, YouTube doesn't allow the greater than symbol in the description so I'm forced to use a unicode lookalike ⋗, please replace it if you copy and paste code from here)

1. At this point we will start adding the ability to upload files from a client request to our server using multer, for that we will add the highlighted code to our REST API:
import express, {json, urlencoded} from 'express'
import morgan from 'morgan'
import morganBody from 'morgan-body'
import multer from 'multer'

// Multer
destination: function (req, file, cb) {
cb(null, 'uploads/')
},
filename: function (req, file, cb) {
if (extension === 'x-javascript') extension = 'js'
if (extension === 'video/quicktime') extension = 'mov'
if (extension === 'video/x-msvideo') extension = 'avi'
}
})
const upload = multer({ storage: storage })

const app=express()

'Access-Control-Allow-Methods': 'PUT, POST, GET'
})
}
})

morganBody(app)

const upload_files = (req, res) =⋗ {
// this function will handle the actions that follow the uploading of the files by multer
}

/****************************************************************/
/* HERE WE SET UP A ROUTE THAT WILL LISTEN TO POST REQUESTS IN */
/* THE /upload_files ROUTE */

})