TASK: 拼贴功能保存用户上传的图片并返回

src/main/java/com/ai/da/service/CollectionElementService.java

@@ -141,4 +141,5 @@ public interface CollectionElementService extends IService<CollectionElement> {
 
     List<CollectionElementVO> selectedImageSeg(List<MultipartFile> files, Long id, String type, String sourceType);
 
+    void updateElementLevel2Type(Long elementId, String level2Type);
 }