Hi I just tested around with powershell Webclient. Everthing seemed to work fine, but then i had to upload a file with a # in the name (test.#00). The File on the Server just strips the .#00. The file on the server is named "test" instead of "test.#00". The test.zip works without any problems.
Here is my Script used on Powershell Windows 10:
$webclient = New-Object System.Net.WebClient
$localPath = "c:\temp\";
$ftp = "ftp://192.168.0.202/"
$webclient.Credentials = New-Object System.Net.NetworkCredential("admin","admin")
$webclient.UploadFile($ftp + "test.zip",$localPath + "test.zip")
$webclient.UploadFile($ftp + "test.#00",$localPath + "test.#00")