Upload progress Nodejs API

Hello,

I am using your API to upload different kind of file through nodeJs.

I saw a lot of people explaining the API currently do not support progress bars and monitoring stuff so I've tried to create a workaround.

I've implemented this method :

monitorTransfer(dbx, fileName, totalSize) {
    console.log('monitoring')
    if (this.continueMonitoring) {
      dbx.filesListFolder({ path: "" }).then((data) => {
        const fileMetadata = data.entries.filter(f => f.name == fileName)
        console.log(fileMetadata)
        // console.log(`uploaded ${fileMetadata.size} on ${totalSize} ==> ${fileMetadata.size / totalSize} %`)
        setTimeout(this.monitorTransfer.bind(this), 500, dbx, fileName, totalSize, continueMonitoring)
      })
      .catch((err) => {
        console.log(`[dropboxConnector] error monitoring : `)
        console.log(err)
        setTimeout(this.monitorTransfer.bind(this), 500, dbx, fileName, totalSize)
      })
    }
  }

I call it every 500 ms until the transfer is over. I have the following problem: 

my file only appears once the transfer is completed : 

monitoring
[]
monitoring
[]
monitoring
[]
monitoring
[]
monitoring
[]
monitoring
[]
monitoring
[ { '.tag': 'file',
    name: 'zouzou-test.js',
    path_lower: '/zouzou-test.js',
    path_display: '/zouzou-test.js',
    id: 'id:WW00APcl7lAAAAAAAAAAPQ',
    client_modified: '2017-06-24T16:28:41Z',
    server_modified: '2017-06-24T16:28:41Z',
    rev: '6458a6c857',
    size: 144256468,
    content_hash: '8968034036d4dd13a8b7ea090245585403a37c2db5386dff6c80da3b00d0c137' } ]

Is there someway to detect my file before the transfer is over? How can I make this work?

I am OK with using chunk transfer if it helps.

Thanks,

Théophile