Solved: How to create Subfolders in Desktop-Client (Web works)

Dear all,
I’m not sure, if I’m right here, but I will ask the question.
Everything ist running great.

When I create Subfolders in the Web-Client, I have to user the Slash (/) between the folders.
This does not work in the Desktop-Client.

Any idea??



Update: Now it works!! - Also with Slash (/)