Starts a new multipart upload.
def start_multipart_upload(object_name: str) -> str: ...
This method starts a new multipart upload for an object named ObjectName, in the bucket currently selected by bucket, and returns the upload Id that the server associates with it. This upload Id can then be used to call the following methods:
If there are any metadata items present in the Metadata* properties, they will be included in the creation request, and will be applied to the final object after the multipart upload is completed with complete_multipart_upload.
Multipart uploads never expire, they must be explicitly completed or aborted using complete_multipart_upload or abort_multipart_upload. The list_multipart_uploads method can be used to retrieve a list of current multipart uploads.
Note: This method is not supported when service_provider is spGoogleStorage (2); Google Cloud Storage does not support multipart uploads.