404 Not Found Nginx Error After SFTP Changes via FireZilla

I just updated my site's (Django; deployed via AWS Lightsail) files via FileZilla but my website won't load now, giving me a 404 error.

I've done some research and they're telling me it is an error with Nginx's conf file, but I'm not sure how I should change it to resolve the issue.

Here is the conf file:

  GNU nano 3.2                            nginx.conf                                      

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
 worker_connections 768;
 # multi_accept on;
}

http {

 ##
 # Basic Settings
 ##

sendfile on;
 tcp_nopush on;
 tcp_nodelay on;
 keepalive_timeout 65;
 types_hash_max_size 2048;
 # server_tokens off;

 # server_names_hash_bucket_size 64;
 # server_name_in_redirect off;

include /etc/nginx/mime.types;
 default_type application/octet-stream;

I've attempted to return to a previous snapshot (that used to function) by creating a new instance, but when I try to load the backup via its public IP it seems to still give me a 404.

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