Android Java HTTP Post .bin file

I am trying to upload a .bin file from an Android Java mobile app to an ESP32 web server. I know the upload is working as I can test it on a web browser, but I have tried different solutions from StackOverflow such Volley, httpClient etc but it crashes on the transfer. Any help how to complete the file upload, looks quite simple as it's just an HTTP post file transfer, I need working code. I do not need any app developing, just some working java code. http code [login to view URL]("POST", upload_path, true); [login to view URL](file); Android java code public void uploadfile() throws Exception { try { File file = new File("/storage/emulated/0/Download/[login to view URL]"); if ([login to view URL]()) { CloseableHttpClient httpClient = [login to view URL](); HttpPost uploadFile = new HttpPost("[login to view URL]"); MultipartEntityBuilder builder = [login to view URL](); // [login to view URL]("field1", "yes", ContentType.DEFAULT_BINARY); // This attaches the file to the POST: File f = new File("/storage/emulated/0/Download/[login to view URL]"); [login to view URL]( "file", new FileInputStream(f), ContentType.DEFAULT_BINARY, [login to view URL]() ); HttpEntity multipart = [login to view URL](); [login to view URL](multipart); // Code is crashing here CloseableHttpResponse response = [login to view URL](uploadFile); HttpEntity responseEntity = [login to view URL](); } } catch (Exception e) { Log.d("Debug", "Catch - software activity 1050"); } }