Nginx can't find file - nginx

Question

I have simple nginx server configuration which works and looks like this:
server {
listen 80;
server_name _;
location /cert {
alias /aaa.txt;
}
location / {
proxy_pass http://127.0.0.1:3000;
}
}
Proxy pass works like it should do but what doesn't work is getting this /aaa.txt file.
I tried changing alias... into:
return 200 'Hi' - This indeed return and download file named Hi
root / > As I read, root just adds to link before so it is not suitable for this situation but tried it
try_files /aaa.txt =404 - Not working
I tried changing permission of /aaa.txt with command chown www-data:www-data aaa.txt and still not working.
I have tried creating folder /wwwroot/ and put it inside that folder and do everything the same but still not working.
I do not know what else to try.
Pointing to answers provided in suggested question Nginx return file for path I edited my setup file and (this time I put it in folder wwwroot) and it is still not working
GNU nano 6.2 /etc/nginx/sites-available/reverse-proxy
server {
listen 80;
server_name _;
location /cert {
index aaa.txt;
alias /wwwroot;
}
location / {
proxy_pass http://127.0.0.1:3000;
}
}

Answer 1

Solution was quite simple. I was all time putting path relative to ~ which is not where nginx starts. In terminal you see it as ~ but its full path is /home/[user]/ so when i created folder wwwroot it was not located at /wwwroot but /home/ubuntu/wwwroot and that is the reason why it coulnd't find it.