Filament on offline production server: blank components

I'm new to filament and it works great in my development environment. But I'm having trouble to make filament work well on our production server. The setup is unconventional because there is no internet connection in the production environment. Also, the project needs to run in a subfolder of the webserver (eq: https://webserver/laravel-project1). Development is done in a separate environment with internet connection. The vendor folder is being zipped and moved over to production manually, as is the 'build' folder. The laravel app works, except for the filament admin panel. The menu items of the resources are displayed, but when clicked, a gateway timeout eventually occurs and there are no errors in the browser console. Also on the homepage of the dashboard, all cards are displayed empty. Obviously, something is missing or not being found... . Any pointers to get me in the right direction? I already did the basics mentioned in the forum rules. Thx.
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