update to s3 using signedurl

uploadS3.js

func uploadfileAWSS3(fileuploadurl, contenttype, file): Observable<any>{ 
  //this will be used to upload all csv files to AWS S3
   const headers = new HttpHeaders({‘Content-Type’: contenttype});
   const req = new HttpRequest(
   ‘PUT’,
   fileuploadurl,
   file,
   {
     headers: headers,
     reportProgress: true, //This is required for track upload process
   });
   return this.http.request(req);
}