Google Drive Rest: convert does not work - vb.net

Question

I am using the G Drive REST endpoints (not .net client) to upload docx files through vb .net. My problem is that if even i declare the query parameter "convert" as true, the files are getting uploaded but they never auto-convert.
The first thing i do is to create a new file with POST and after that i upload the content with Put in the upload uri in a separate request.
it does not even work when i use the Google Playground to upload the docx files.
Public Shared Function UploadStream(fileStream As IO.Stream, filename As String, mimetype As String, target As String, accesstoken As String, Optional ConvertToGDoc As Boolean = False) As String
Try
Dim subject As String = ""
Dim doc As New Aspose.Words.Document
Dim docformat = Aspose.Words.FileFormatUtil.DetectFileFormat(fileStream) ' detect the format of the file Then 'check if the file is doc or docx
If docformat.LoadFormat = Aspose.Words.LoadFormat.Doc Or docformat.LoadFormat = Aspose.Words.LoadFormat.Docx Then 'check if the file is word document
doc = New Aspose.Words.Document(fileStream)
subject = doc.BuiltInDocumentProperties.Subject 'get the subject from the word file
If doc.BuiltInDocumentProperties.Subject = "" Then subject = "none"
Else
subject = "none" 'set the subject as none if the file is not word file
End If
Dim localmd5 = Files.MD5stream(fileStream)
Dim baseaddress = "https://www.googleapis.com/drive/v2/files?convert=" + ConvertToGDoc.ToString
Dim req = Net.HttpWebRequest.Create(baseaddress)
req.Method = "POST"
req.Headers.Add("Authorization", "Bearer " + System.Web.HttpUtility.UrlEncode(accesstoken))
req.ContentType = "application/json"
Dim writer = New Newtonsoft.Json.Linq.JTokenWriter()
writer.WriteStartObject()
writer.WritePropertyName("title")
writer.WriteValue(filename)
writer.WritePropertyName("parents")
writer.WriteStartArray()
writer.WriteRawValue("{'id':'" + target + "'}")
writer.WriteEndArray()
writer.WritePropertyName("properties")
writer.WriteStartArray()
writer.WriteRawValue("{'key':'Subject','value':'" + subject + "'},{'key':'MD5','value':'" + localmd5 + "'},{'key':'Author','value':''}")
writer.WriteEndArray()
writer.WriteEndObject()
Dim bodybytes = Text.Encoding.UTF8.GetBytes(writer.Token.ToString)
req.ContentLength = bodybytes.Length
Dim requestStream = req.GetRequestStream
requestStream.Write(bodybytes, 0, bodybytes.Length)
requestStream.Close()
Dim resp As System.Net.HttpWebResponse = req.GetResponse()
Dim response = New IO.StreamReader(resp.GetResponseStream, False).ReadToEnd
Dim json As Newtonsoft.Json.Linq.JObject
json = Newtonsoft.Json.Linq.JObject.Parse(response)
Dim fileId = json.SelectToken("id").ToString()
baseaddress = "https://www.googleapis.com/upload/drive/v2/files/" + fileId + "?uploadType=media&convert=" + ConvertToGDoc.ToString
req = Net.HttpWebRequest.Create(baseaddress)
req.Method = "Put"
req.Headers.Add("Authorization", "Bearer " + System.Web.HttpUtility.UrlEncode(accesstoken))
bodybytes = General.GetStreamAsByteArray(fileStream)
req.ContentLength = bodybytes.Length
req.ContentType = mimetype
requestStream = req.GetRequestStream
requestStream.Write(bodybytes, 0, bodybytes.Length)
requestStream.Close()
resp = req.GetResponse()
response = New IO.StreamReader(resp.GetResponseStream, False).ReadToEnd
Return fileId
Catch ex As Exception
Return Nothing
End Try
End Function
Shared Function GetStreamAsByteArray(ByVal stream As System.IO.Stream) As Byte()
Dim streamLength As Integer = Convert.ToInt32(stream.Length)
Dim fileData As Byte() = New Byte(streamLength) {}
stream.Position = 0
' Read the file into a byte array
stream.Read(fileData, 0, streamLength)
stream.Close()
ReDim Preserve fileData(fileData.Length - 2)
Return fileData
End Function
Public Shared Function MD5stream(ByVal File_stream As IO.Stream, Optional ByVal Seperator As String = Nothing) As String
Using MD5 As New System.Security.Cryptography.MD5CryptoServiceProvider
Dim Hash() As Byte = MD5.ComputeHash(File_stream)
Return Replace(BitConverter.ToString(Hash), "-", Seperator)
End Using
End Function
Had anyone else the same problem?