Data can be uploaded to OBS using multipart uploads. Fragments are generated, if a multipart upload fails because of the following reasons (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.
Fragments on OBS consume storage spaces that are charged according to price rates of storage space.
You can also select multiple fragments and click Delete on the top of fragment list to batch delete them.