Ok, we got the first problem worked out (https://www.wix.com/code/home/forum/questions-answers/site-maintenance-dilemma).
Now the second. I have a big, complex form as a dynamic page. It holds the possibility to upload pics per logged in user and it doesn´t work on interface level as I wrote here: https://www.wix.com/code/home/forum/questions-answers/huge-problems-with-uploading-pics
I need to do some serious code rewriting. But the page is live. I cannot copy a dynamic page and work on that. I cannot run in preview mode because it has wix-user stuff. I also cannot copy the whole site because I am no longer Owner, just Admin.
So how do I work on it without bothering current users with my intermediate stages, bugs, etc?
Any ideas would be very welcome.