"file-drop" feature not present - only via link?

Hey everybody,
I saw here that you can share a folder with a user on your NC with the option “file drop (upload only)”.
However, this is not present in my NC 15.0.2.
I found the switch for allowing to share via link and there I can find the option to share “upload only”. Strange: When I share with a user, this option is missing.

Maybe someone can help me with this?

Could be the same bug like in this topic created by the social-sharing-apps:

Hey, thanks for your input. No, definately not. I disables “sharing via XYZ” and also sharing via email… still the “Upload only” thing is not there.