DuckDuckGo for Android seems to fail when downloading files secured by basic auth.
Here we provide two subdirectories with some content to browse or download. Each of them contains a pdf file, a text file and a binary (spreadsheet) file.
Use the following credentials:
My observation is that DDG fails when downloading from the secured, but not when downloading from the unsecured directory. Browsing a text file seems to be no problem, where downloading fails. DDG does not display pdf files as other browsers do.