Update app.py

app.py

@@ -147,19 +147,17 @@ Provide a concise, user-friendly interpretation of these findings in simple term
 # Step 1: Inspect file
 def preview_file(file):
     msg, cols, preview = inspect_file(file)
-
-    # Add a placeholder choice for no selection
-    # This ensures the user can explicitly say "no time column"
+    # Add placeholder choice
     if len(cols) > 0:
         cols = ["(No time column)"] + cols
         default_value = "(No time column)"
     else:
-        # If no columns detected, just leave empty
         cols = []
         default_value = None
+    
+    # Use gr.update(...) for the dropdown output
+    return msg, gr.update(choices=cols, value=default_value), preview
 
-    # Return a dictionary for the Dropdown output
-    return msg, {"choices": cols, "value": default_value}, preview
 
 
 with gr.Blocks() as demo: