To test the file permissions, I temporarily set up all the files/folders to 0777, basicaly telling everyone has permissions to do anything, and I still get an 404 page.
The filepath I get from the console output seems valid too.
I created a subdomain to just toss the files and check if there was something wrong with the website. The files uploaded on the subdomain where acessible on the browser and on the Web Editor, when calling the files by URL.