Powershell upload to dropbox converted to powershell2

powershell upload to dropbox powershell 2

<#
Ported to powershell2 from script by Laurent Kempé 
http://laurentkempe.com/2016/04/07/Upload-files-to-DropBox-from-PowerShell/

.SYNOPSIS
This is a Powershell script to upload a file to DropBox using their REST API.

.DESCRIPTION
This Powershell script will upload file to DropBox using their REST API with the parameters you provide.

.PARAMETER SourceFilePath
The path of the file to upload.
.PARAMETER TargetFilePath
The path of the file on DropBox.

.ENV PARAMETER DropBoxAccessToken
The DropBox access token.
#>


function Invoke-DropboxUpload {
Param(
    [Parameter(Mandatory=$true)]
    [string]$SourceFilePath,
    [Parameter(Mandatory=$true)]
    [string]$TargetFilePath,
    [Parameter(mandatory=$true)]
    [string]$ApiKey
)

$url = "https://content.dropboxapi.com/2/files/upload"

$file = [IO.File]::ReadAllBytes($SourceFilePath)
[net.httpWebRequest] $req = [net.webRequest]::create($url)

$arg = '{ "path": "' + $TargetFilePath + '", "mode": "add", "autorename": true, "mute": false }'
$authorization = "Bearer " + $ApiKey

$req.method = "POST"
$req.Headers.Add("Authorization", $authorization)
$req.Headers.Add("Dropbox-API-Arg", $arg)
$req.ContentType = 'application/octet-stream'
$req.ContentLength = $file.length
$req.TimeOut = 50000
$req.KeepAlive = $true
$req.Headers.Add("Keep-Alive: 300");
$reqst = $req.getRequestStream()
$reqst.write($file, 0, $file.length)
$reqst.flush()
$reqst.close()

[net.httpWebResponse] $res = $req.getResponse()
$resst = $res.getResponseStream()
$sr = new-object IO.StreamReader($resst)
$result = $sr.ReadToEnd()
$result
$res.close()

}

Wow, great script, but no instructions. When I create my API access key can I keep the app I've created in developer mode or do I need to submit for production? How should I pass the parameters into the script? I guess I just want to know all the missing stuff. What do I need to know to make this work in an hour from now?

please make it a function or make it a module add some examples it makes work a lot more easier.