try with subfolder again

app.py

@@ -27,7 +27,9 @@ def run_on_gpu(input_point_cloud: gr.utils.NamedString,
 
     in_file = '{}'.format(input_point_cloud.name)
     out_dir = os.path.dirname(in_file)
-    out_file = in_file + '_out.obj'
+    out_file_basename = os.path.basename(in_file) + '.obj'
+    out_file = os.path.join(out_dir, os.path.basename(in_file), out_file_basename)
+    os.makedirs(out_dir, exist_ok=True)
 
     model_path = 'models/ppsurf_50nn/version_0/checkpoints/last.ckpt'