If that is your hook.cgi code, it doesn't do anything ; it compiles sub hook and exits the program without calling it (actually as posted it won't even compile)

or if you're trying to use jQuery::File::Upload, then you're not copy/pasting well enough, so click jQuery::File::Upload and read and copy/paste better :)

See also Mojolicious::Lite +and jQuery +AJAX + Mojo::Template

And a copy-pasta for you:)

Also, there are checklists for that , Basic debugging checklist , brian's Guide to Solving Any Perl Problem, CGI Help Guide , Troubleshooting Perl CGI scripts

Yes, work through these checklists, when you find a problem on the list, use a solution from the list, when you find a problem not on the list (rare), post the error message and problem description here

brian's Guide to Solving Any Perl Problem, CGI Help Guide , Troubleshooting Perl CGI scripts

So examine your server configuration and compare to https://httpd.apache.org/docs/2.2/howto/public_html.html#cgi / Apache Tutorial: Dynamic Content with CGI

learn about the internet,Web Programming: For Beginners, to get an overall picture of how the internet works, how tcp/ip, sockets, html, ajax, all fit together.