Hi-
The problem is that you hided wp-admin and its files and at the same time you use one of its file for uploading.
This file that file used for uploading:
wp-admin/async-upload.php
This trick may work: add following line to Replace URLs and re-configure Nginx, adn try again:
wp-admin/async-upload.php==upload-ajax
If it doesn’t help you should add seller account to trusted users list or disable hide wp-admin feature. Of course, they can see wp-admin after that.
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This reply was modified 10 years, 5 months ago by Hassan. Reason: The URL was removed