Hi Denis,
We made some test on help button and noted one thing is that
Suppose we use www.google.com to replace the URL for help button, in the final url, it will be repleaced as www.google.com/en/default.htm
I guess there might be some workflow in the backend to automate this kind of url (append xx/default.htm)
We will test tutorials button today and I think this time it might work
Best regards
Alex yang