Update app.py

app.py

@@ -28,7 +28,7 @@ def run_survey(surveyor, download_placeholder, research_keywords=None, arxiv_ids
         d.mkdir(exist_ok=True, parents=True)
     print(survey_root)
     print(dir_args)
-    dir_args = {k: str(v.resolve()) for k, v in dir_args.items()}
+    dir_args = {k: f'{str(v.resolve())}/' for k, v in dir_args.items()}
     zip_file_name, survey_file_name = surveyor.survey(research_keywords, 
                                                         arxiv_ids,
                                                         max_search=max_search,