def upload_single(self):
        blob_service_client = BlobServiceClient.from_connection_string(self.connection_string)
        download_links = {}

        for root, dirs, files in os.walk(self.folder):
            for file in files:

                full_path = os.path.join(root, file)

                # ignore hidden files
                if file.startswith("."):
                    continue

                # if list_files is given, only upload matched files
                if self.list_files and file not in self.list_files:
                    continue

                # if extension is given only upload if extension is matched
                if self.extension and os.path.isfile(full_path) and not file.lower().endswith(self.extension.lower()):
                    continue

                blob_folder = root.replace(self.folder, "").lstrip("/")

                if self.blob_folder:
                    # we only want to append blob_folder if it actually is a path or folder
                    # blob_folder can be empty string ""
                    if blob_folder:
                        blob_folder = os.path.join(self.blob_folder, blob_folder)
                    else:
                        blob_folder = self.blob_folder

                # if no folder is given, just upload to the container root path
                if not blob_folder:
                    container = self.destination
                else:
                    container = os.path.join(self.destination, blob_folder)
                container_client = blob_service_client.get_container_client(container=container)

                with open(full_path, "rb") as data:
                    logging.debug(f"Uploading blob {full_path}")
                    container_client.upload_blob(data=data, name=file, overwrite=self.overwrite)

                if self.create_download_links:
                    download_links[file] = self.create_blob_link(blob_folder=blob_folder, blob_name=file)

        return download_links