Did you install on Windows subsystem or are you using that to ssh into your server? If you installed on WSL then chmod and other permissions probably won’t work by default how you intend due to limitations.
no success in a different browser?
do you see the javascript code in your browser when you go direct to:
https://URL/js/jquery.min.js
php7.2-json php7.2-mbstring were installed?
Go back to inspect element click network and compare highlighted values from Request Headers, when you change from svg to png. is it similar?
