Restore Upload PDF tab

app.py

@@ -141,6 +141,12 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
 
     gr.Markdown("## 📄 PDF Q&A Bot with Weaviate + OpenAI")
 
+    with gr.Tab("Upload PDF"):
+        pdf_input = gr.File(label="Upload PDF", type="filepath")
+        upload_btn = gr.Button("Process PDF")
+        status = gr.Textbox(label="Status")
+        upload_btn.click(process_pdf, inputs=pdf_input, outputs=status)
+
     with gr.Tab("Ask Questions"):
         question = gr.Textbox(
             label="Your Question",