WebClient OpenWriteAsync Not Updating File

Hello, everyone! I'm using the WebClient class' OpenWriteAsync function, and I'm having a little trouble with it. I want it to write some information to a .txt file I have uploaded on my FTP. I made it display a message after it has completed doing so, and the message does indeed pop up. However, I've checked my .txt file numerous times, and it hasn't actually been edited. I'm wondering if someone could please help me out with this. Here's some of my code:

Code:

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Dim otherclient As New WebClient()

AddHandler otherclient.OpenWriteCompleted, AddressOf WriteCompleted

otherclient.OpenWriteAsync(New Uri(URL))

Private Sub WriteCompleted(ByVal sender As System.Object, ByVal e As OpenWriteCompletedEventArgs)
    Try
        If e.Error Is Nothing And e.Cancelled = False Then
            Dim FileStream As Stream = e.Result

            Dim Bytes() As Byte = System.Text.Encoding.UTF8.GetBytes(txtTest.Text & vbNewLine)

            FileStream.Write(Bytes, 0, Bytes.Length)
            FileStream.Flush()
            FileStream.Close()

            MsgBox("Complete!")
        Else
            MsgBox(e.Error)
            Exit Sub
        End If
    Catch ex As Exception
        MsgBox(ex.Message)
           
        Exit Sub
    End Try
End Sub

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Am I doing anything wrong or missing something? Thanks in advance!

I'm sorry for double-posting, but I really need help with this. I've been looking online for help (with no luck), and I've tried numerous times to get this to work, but I keep experiencing the same problem: the program goes through with the entire process and says that it completed successfully, but if I check my FTP, nothing has happened.

Thanks again in advance for any help.