Update app.py

app.py

@@ -389,8 +389,9 @@ with gr.Blocks(title="PDF to Audio", css="""
             
             openai_api_key = gr.Textbox(
                 label="OpenAI API Key",
-                visible=not bool(os.getenv("OPENAI_API_KEY")),
+                visible=True,  # Always show the API key field
                 placeholder="Enter your OpenAI API Key here...",
+                type="password"  # Hide the API key input
             )
             text_model = gr.Dropdown(
                 label="Text Generation Model",