Hello, everyone.
I am looking for a way to transfer large binary files (>100MB) both ways using a web service as a client in PB19R3. For example with the help of stream, see below the client code in C#.  Is this a reasonable solution and how to rewrite it in PowerBuilder? Or is it better to use other methods? HttpCLient? RestClient? Right now it's written via OLE "xmlhttp.connecttonewobject("Msxml2.ServerXMLHTTP.6.0")".
Thank you for your answer or tips.

Code in C#:

using (FileStream fsSource = new FileStream(ulozitDokumentPozadavek.CestaKSouboru, FileMode.Open, FileAccess.Read))
{
  var pozadavek = new Sluzba.Dms.Rozhrani.Funkce.UlozitDokumentStreamPozadavek();
  pozadavek.KlicovaSlova = "Klíčová slova";
  FileInfo fileInfo = new FileInfo(ulozitDokumentPozadavek.CestaKSouboru);
  pozadavek.NazevSouboruSPriponou = fileInfo.FullName;
  pozadavek.Stream = fsSource;
  pozadavek.OsobaId = KlientSluzby.AktivniInstanceServeru.OsobaId;
  pozadavek.Predmet = "Pokusný předmět";
  pozadavek.SlozkaId = KlientSluzby.AktivniInstanceServeru.SlozkaId;
  var odpoved = KlientSluzby.Sluzba.UlozitDokumentStream(pozadavek);
}

Test XML from SOAPUI:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
   <soapenv:Header>
      <tem:Velikost>39</tem:Velikost>
      <tem:SlozkaId>17</tem:SlozkaId>
      <tem:Predmet>Test</tem:Predmet>
      <tem:OsobaId>2</tem:OsobaId>
      <tem:NazevSouboruSPriponou>pokus.txt</tem:NazevSouboruSPriponou>
      <tem:KlicovaSlova>Vesmir, Galaxie, Dalka</tem:KlicovaSlova>
   </soapenv:Header>
   <soapenv:Body>
      <tem:UlozitDokumentStreamPozadavek>
         <tem:Stream>cid:1235208661655</tem:Stream>
      </tem:UlozitDokumentStreamPozadavek>
   </soapenv:Body>
</soapenv:Envelope>