Update app.py

app.py

@@ -204,7 +204,7 @@ def load_files_for_sidebar():
     groups = defaultdict(list)
     for f in all_files:
         fname = os.path.basename(f)
-        prefix = fname[:10]
+        prefix = fname[:17]
         groups[prefix].append(f)
 
     for prefix in groups: