pInfo, err = api.PutObjectPart(ctx, tgtBucket, tgtObject, res.UploadID, i+1, pReader, opts)
		if err != nil {
			return err
		}
		if pInfo.Size != objInfo.Size {
			return fmt.Errorf("Part size mismatch: got %d, want %d", pInfo.Size, objInfo.Size)
		}
		uploadedParts = append(uploadedParts, CompletePart{
			PartNumber: pInfo.PartNumber,
			ETag:       pInfo.ETag,
		})
	}