fix: replace filepath_input Textbox to Dropdown

app.py

@@ -163,9 +163,13 @@ with demo:
                 "도착어", "língua alvo"
             ])
         )
-        filepath_input = gr.Textbox(
+        filtpath_list = ["tasks/masked_language_modeling.md", "main_classes/callback.md"]
+        filepath_input = gr.Dropdown(
+            choices=filtpath_list,
             value="tasks/masked_language_modeling.md",
-            label="File path of transformers document"
+            label="File path of transformers document",
+            interactive=True,
+            allow_custom_value=True,
         )
     with gr.Tabs():
         with gr.TabItem("Web UI"):