I made a workaround myself, but it is so complex that I can't make it work in the same way for all users.
Someone zips the files form sharepoint andd sends them to the different users, it is routed there via a rule in a seperate folder.
The folder gets checked by Flow, the attachment gets saved in the personal Onedrive, and unzips. The zip-file gets deleted, the initial mail also. The user almost didn't notice the whole flow. Quite a workaround, isn't it? 🙂
But I will wait fot the 'copy a folder'-possibility now.