Deleting partially uploaded objects
You can upload an object in parts using multipart upload. You can't see or delete these objects in the management console. To do this, use tools that support multipart uploads.
AWS CLI
aws --endpoint-url=https://storage.yandexcloud.net s3api abort-multipart-upload --bucket <bucket-name> --key <key> --upload-id <number>
If you don't know the upload ID (number), find it in the list of uploads.
aws --endpoint-url=https://storage.yandexcloud.net s3api list-multipart-uploads --bucket <bucket-name>