Why I can't copy snapshots to a different drive

[Sandman192]

• I have read the README.md document <-- Don't know where to find that
• [ x] I am using the latest version of Warehouse
• I am using the Flatpak package of Warehouse <-- (Does not say)
• [ x] I have not found any other opened issues on the same topic

Why I can't copy snapshots to a different drive.
While trying to do a snapshot restore test I can't find a way to do that.
Can't trash the snapshot that is already taken.
Will not snapshot Alien Arena.

I want to do a clean install of Bazzite and use the Snapshot on a different drive to re-download all the apps I had before.

If applicable, provide steps to reproduce the issue

flatpak run io.github.flattool.Warehouse

(process:2): Gtk-WARNING **: 17:30:59.558: Unknown key gtk-modules in /home/bazzite/.var/app/io.github.flattool.Warehouse/config/gtk-4.0/settings.ini