This method is used to complete attachments upload once the files have been uploaded to Amazon S3.
List<ResultObject> completeUpload(List<ID> wipIds)
Parameters:
wipIds: List of Salesforce ids for attachment "file" records. These IDs have been returned from the initializeUpload() method for each file record.
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attachment "file" records. These IDs have been returned from the initializeUpload() method for each file record.
Return Value: The method will return the list of Result Object (Figure 127), which holds filecompletion status information.
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