Data can be uploaded to OBS using multipart uploads. There will be fragments generated, if a multipart upload fails because of the following causes (included but not limited to):
On OBS Console, storage used by fragments is charged. Clear fragments when they are not needed. If a file upload task fails, upload the file again.
Generated fragments take up storage space that is billable.
You can also select multiple fragments and click Delete above the fragment list to batch delete them.