A. If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again

B. Use Multipart Upload to upload parts of a file in parallel to speed up the upload process

C. Multipart Upload is usually used when the size of the file to be uploaded is large

D. After an upload is interrupted, the portions of the file which have successfully uploaded prior to the interruption will be saved in the OSS bucket