The application form is not letting me attach CV and cover letter: $ echo $BROWS...

The application form is not letting me attach CV and cover letter:

    $ echo $BROWSER
    /usr/bin/qutebrowser
    $ qutebrowser --version
    qutebrowser v1.10.1
    Git commit:
    Backend: QtWebEngine (Chromium 73.0.3683.105)
    Qt: 5.13.2
    ...

I do not have a file browser apart from bash so an unable to drag and drop. Is the "Attach file" button supposed to open the file-selector? It remains unresponsive when I click it.

Alternatively, is there a way I could directly mail in an application?