Why is there no data download/upload between the Klett Sprachen App and the Cloud? 25 June 2021 12:47 Updated Check your internet connection. You must have a stable connection to save or download data. Related articles What is the Klett Sprachen App? Where can I find the allango licence key? What are access codes and where do I enter them? Why can't I hear anything even though I’m logged into the online seminar?