File Upload: Unsupported file format: Text or XML only zrsplf_file_upload

Hi all together,

always I want to uplaod data via the how to Upload data with zrsplf_file_upload I get the error message: File Upload: Unsupported file format: Text or XML only. But I use a .txt-file "upload_test.txt" and the file have the same structure which I had difined in File Format. Any Idea what could be the reason?

Could that be a problem of Authorization or of Connection to the network because I have to work with VPN? Do somebody have expirients with that?

Thanks a lot.

Best regard,

Manuel