修复bug-51244

src/main/java/com/fdkankan/scene/service/impl/SceneProServiceImpl.java

@@ -165,7 +165,7 @@ public class SceneProServiceImpl extends ServiceImpl<ISceneProMapper, ScenePro>
 
     @Override
     public ResultData uploadTagImg(String num, MultipartFile file, String sid, Integer size, Integer tileSize) throws Exception {
-        String extName = FileUtil.extName(file.getOriginalFilename());
+        String extName = FileUtil.extName(file.getOriginalFilename()).toLowerCase();
         String fragmentPath = String.format(ConstantFilePath.SCENE_USER_PATH_V4, num) + "hot_img_fragment/";
         String workPath = fragmentPath + sid;
         String dziPath = workPath + ".dzi";