Update: Extra information, I used VSCode Live server to host the static files locally, and I ve found it works. So it could be an issue with how CPanel deals with static files?
I am having a problem with the NextJS static site generation. Chunks, SVG files & subpages are not loading because of both 404 not found errors and MIME type. The build process is error free though.
This export has worked before in the past, so im not sure what happened since then. I'm using CPanel to host static files.
You can see the live site with errors in the console at: https://quincegr.com
You'll see that some of the CSS and HTML is working, but the JS isn't, also the links (which are the images below) lead to a default 404 not found page.
The github is public too: https://github.com/spikethea/portfolio
I used 'next build' to produce the build folder, then placed the contents into public_html (CPanel root folder for hosting files)



Fixed my Issue. Possibly to do with having a subdomain. For anyone who has this issue and is using CPanel with NextJS SSG: