When I try to change the default upload filesize from 513MB to 10 GB it fails with the following error in the browser log:
POST https://<domain>/settings/admin/additional 405 (Method Not Allowed) Navigated to https://<domain>/settings/admin/additional
No entries in the NC logfile seen.
the .htaccess file is owned by www-data:
-rw-r--r-- 1 www-data www-data 3654 Aug 24 16:52 .htaccess