Set parallel uploads

main.py

@@ -209,7 +209,7 @@ def single_impl(item_directory: pathlib.Path, ia_collection: str, ia_item_title:
 
             def upload_file():
                 logging.info(f"Uploading file {rel_file}...")
-                client.fput_object(bucket_name=bucket_name, object_name=str(rel_file), file_path=file)
+                client.fput_object(bucket_name=bucket_name, object_name=str(rel_file), file_path=file, num_parallel_uploads=8)
 
             retry_failures(upload_file, f"Failed to upload {rel_file}")