Open Source Document Management System | OpenKM

I created a openkm server with the docker image openkm-ce:6.3.9-DEV. I configured the email account for an user. When I click on the server list button, i can see the mail:
If I set the checkbox behind the mail and click on Import, nothing happens.
Also the docker log shows nothing.

When you import from users view ( bottom option ) is not working too ?
Did you checked the path /okm:mail/userId/ if there has been created some folder in the document into ?