Many thanks. Fix applied and works! Webmin 1.930 on Debian 9 server x64
My customer had a similar issue today. He can browse files through File Manager, but when he tries to create one, he gets "You are not allowed to access '/%2Fsrv%2Fwww%2Fnew%5Fiba%2Fpublic%5Fhtml'. The allowed directories are :'/srv/www, /var/log/apache2'. However, he can upload the same file through file upload/download without any problems.