Download the file to display 404 error

[gengbao12135412]

This file name is uploaded after
Download the file to display 404 error
For example:
http://146.0.75.214/c7cc41dd89ef5fc5/a044fe4a3696e7ba094731e4d88b4fab.gif

Here is my NGINX rule.
Please help me analyze where there is a mistake.

server
    {
        listen 80;
        #listen [::]:80;
        server_name ********.com www.********.com;
        index index.html index.htm index.php default.html default.htm default.php;
        root  /home/wwwroot/default;
        location / {
		if (!-e $request_filename) {
			rewrite ^/(.*) /index.php?_page_url=$1 last;
		}
        }

        location /files/ {
        internal;
        }
        # these locations would be hidden by .htaccess normally
        location /core/logs/ {
        deny all;
        }
        #include yeti.conf;
        #error_page   404   /404.html;
        location ~ [^/]\.php(/|$)
        {
            # comment try_files $uri =404; to enable pathinfo
            # try_files $uri =404;
            fastcgi_pass  unix:/tmp/php-cgi.sock;
            fastcgi_index index.php;
            include fastcgi.conf;
            #include pathinfo.conf;
        }
		
        # YETI Pseudo static code BEGING ============
		# YETI Pseudo static code END =============
        access_log  /home/wwwlogs/y.log  access;
    }