Trouble with Hetzner VPS, 404 and Flarum

Thank you.

and gd solution on flarum is this: sudo apt install php7.4-gd, not sudo phpenmod gd

Oldemar that totally depends on the os and PHP version in use.

The folder is fine on return: https://test.com/index/:

The page you requested could not be found. 
Return to Test

But the file is not fine. So can you tell me what is wrong with the file?
https://test.com/index.html

404 Not Found
nginx/1.18.0 (Ubuntu)

You can see nginx (₁ week ago)

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