Thank you for reply. It is easy when you see it in front. Explain is sometimes difficult.
At the picture you can see the field I meant.
At setting I choose external storages (Administration).
I fill in Folder name, External Storage, Authentication, Configuration.
The last field is Available for. This field is always blank. I can not choose a user of group.
I tried to fill in a user myself, the NC20 recognized the user, but make the field blank again.
THX,
Peropjot