Persistent shared folder managment of users

I’m creating persistent shared folder as described at https://docs.nextcloud.com/server/16/admin_manual/configuration_files/file_sharing_configuration.html#creating-persistent-file-shares

I have a group with a number of users. The admin user has created a folder and shared it with the group.

One member of the group has removed the shared folder and so has no access to its contents. How can I get them access again and stop members from removing the folder again?

Thanks