The folder (ex. https://test.com/error/) is correct on The page you requested could not be found / Return to test, but file (ex. https://test.com/error.html) is 404 Not Found nginx/1.18.0 (Ubuntu)
I have composer update, upgrade, php flarum migrate, cache:clear and disabled Extension, except English and Canonical. See here if you want config.php, php flarum info, nginx, .nginx and /etc/nginx/sites-available/test.conf, /storage/logs or other things.
file
Not found, examples: index.html, blabla.php, etc, (https://test.com/index.html)
'debug' => false and 'debug' => true (incorrect)
404 Not Found
nginx/1.18.0 (Ubuntu)
folder
Not found, but examples: /image/, /abcd/, etc (https://test.com/index/)
'debug' => true
RouteNotFoundException
'debug' => false (correct)
The page you requested could not be found. / Return to test
So, can you tell me folder is correct, but file is 404?