Thank you a lot for your fast response!
I tried a few things today. I limited the download link to be visible just for a single Wordpress user. But when i copy the link to an other webbrowser that is not logged in the file is still possible to load.
Example "file direct link":
https://www.mywebsite.com/folder/download/2/kunde-01/31/secretfile.zip If i use an other webbrowser that is not logged in into wordpress, the file is not visible in the directory view theme (thats cool) - but when i copy the "file direct link" the file is still downloadable.
I guess i set up a setting wrong?
Thank you a lot for your time!!!!
Christoph