For what it's worth, I found that if you need to change the config path on an entry point (the NAmdConfig), that there is some sort of cache because it won't update unless you first put a bad path, handle the error, then put a good path. Or, after you upload the file (regardless if you set URL timestamp), you also need to click the little "edit" link aside the "download" link, then click the save button in the edit dialog that pops up and that seems to update everything. Bizzare.