fix bug

examcloud-core-questions-service/src/main/java/cn/com/qmth/examcloud/core/questions/service/impl/PaperServiceImpl.java

@@ -860,6 +860,7 @@ public class PaperServiceImpl implements PaperService {
 
         PaperDetail paperDetail = Model.of(paperDetailRepo.findById(paperDetailId));
         PaperDetailUnit paperDetailUnit = new PaperDetailUnit(paper, paperDetail, question);
+        paperDetailUnit.setPaperType(PaperType.IMPORT);
         PaperDetailUnit paperDetailUnit2 = paperDetailUnitService.findTopOrderByNumber(paperDetail, "DESC");
         if (paperDetailUnit2 == null) {
             paperDetailUnit.setNumber(1);