Hi there!
So I checked the frontier post plugin files and found this statement:
$postid = wp_insert_post( $my_post );
}
else
{
// update the post into the database
$my_post['ID']=$postid;
wp_update_post( $my_post );
}
So from this, I think I can safely say that it dues use the wp_insert_post method. Also, I found no errors on the server side. Can’t really see any problém here. ??