note 8 secure folder backup and restore problem

i am using galaxy note 8 for the past one month i have been suffering from the failure of the secure folder of samsung i am neither able to backup my data in secure folder nor i am able to restore my data from secure folder i have reset the phone also then also it tells that back failed an unknown error occured my note 8 is running on april security patch there no uodate to secure folder app please help community