Pydio8 share folder to ldap group problem

Hi,
I configured the ldap pydio8, set to share ldap group, but it does not take effect, no problem sharing ldap users, what is the reason?
my ldap group config:
groups dn: ou=test,dc=abc,dc=local,dc=com
ldap groups filter: objectClass=group
group attribute: cn
role prefix: empty

attributes mapping: empyt.

thanks,
Bill