Bucket Explorer provides Multipart upload, facilitates user to upload a single object as a set of parts. In upload process, each part is a portion of the object's data, and each part can be uploaded independently. Multipart Upload offers many benefits over simple upload, specially when object size is very large.
Multipart upload facilitates user to :

• Restart Uploading Objects : If a part fails to upload then you only need to resend the data for that part only.
• Pause Upload Operation : You can pause a part which is being uploaded with multipart upload.
• Parallel Upload : Mulitipart upload provides benefits of uploading object parts in parallel.
• You do not need to worry about the size of object, you can upload parts without knowing the size of the final object.
• Canceling multipart upload no longer billed for any storage that was associated with the parts which have been stored.