Secret Lair 2.2 doesn't work as required (Patreon)

This week I've tried to work with Coppermine's web gallery, to build a new version of my 'secret lair', but it doesn't work the way I want it. It seems that it's not possible to create subfolders in an album with Coppermine, but that's important for the structure of my lair.

You can see how far I came at:

https://gagala.org/Coppermine/index.php

If you work with Coppermine web galleries and know how to add subfolders to an album, let me know.

If you know a better, still maintained, free web gallery, let me know.

Please and thank you!