In many cases, admins are keen on previewing a listing before delivery.
Many times, they encounter not seeing the watermarked version of the listing which indicates that the listing is not locked and that agents can freely download the content which is not the case
What you would need to do is to open an incognito window. This is crucial since accessing a listing from your regular browser will detect that you have your admin account login which would bypass the lock on the listing
Here's what you should see after accessing a listing that's been locked