I am using RoxyFileman in ASP.NET Core for file upload under Nginx and Ubuntu. I am getting 404 not found message instead of pop-up html box for file upload after clicking file upload button.
File Location: /var/www/example.com/wwwroot/lib/fileman/index.html

Url for Pop-up html for fileupload:

https://www.example.com/lib/fileman/index.html?integration=custom&txtFieldId=FileURL

How can I get the above pop-up html page url after the button click?