Revert previous commit

Gradio_UI.py

@@ -275,7 +275,7 @@ class GradioUI:
                 scale=1,
             )
             # If an upload folder is provided, enable the upload feature
-            if self.file_upload_folder is None:
+            if self.file_upload_folder is not None:
                 upload_file = gr.File(label="Upload a file")
                 upload_status = gr.Textbox(label="Upload Status", interactive=False, visible=False)
                 upload_file.change(