Aggregation for the CSS and JS files

Problem/Motivation

Hello,
I installed the module and it works for the minification of the JS and CSS files (I get the ...files/css/optimized/css and files/js/optimized/js URLs) but looks like it doesn't work for the aggregation of the files as I get more than 100 CSS files and quite the same for the JS files.

I have the latest version of the module (6.0.0-alpha 1)
The Drupal version is 10.1.5

Thanks,
Laurent