After the SAML authentication was working, I wanted configure the StorageZones.
The first try with a restricted SZ failed and my colleague told me to try it again without the restrictions.
The second try worked better, but the upload of files always failed.
I found the right input in the blog of Jason Samuel again: Link
I could make the settings (deactivate TLS 1.2) with the descriped tool IIS Crypto and test it successful after that:
Source: Jason Samuel
Script: NS-Sharefile