Uploads a multipart upload part.
s3client.uploadPart(objectName, partNumber, uploadId, [callback])
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
This method uploads a part for the multipart upload of the object named ObjectName specified by UploadId.
PartNumber specifies the part's number; it must be a value in the range 1 to 10000, inclusive. If a part with the given number already exists in the specified multipart upload, it is replaced with the newly-uploaded part.
The data to upload is taken from either LocalFile or ObjectData (whichever data is found in first, when checked in that order). Each part must be at least 5MB in size, except for the last part in the overall multipart upload, which can be any non-zero size.
If the IncludePartMD5 configuration setting is true, the class will include an MD5 digest of its data when sending it to the server. The server will then verify that the data was received without corruption.
Note: This method is not supported when ServiceProvider is spGoogleStorage (2); Google Cloud Storage does not support multipart uploads.