Hi,
The system I'm using is :
First go to :
https://invenio.bundesarchiv.de/basy...nio/main.xhtml
at the left side you’ll find ‘Tektonik’ . With the arrow up and arrow down you can navigate to the various subjects.
With ‘Klassification’ (at the lower left side) one can go more in detail, which are shown at the right side of the screen. For the files which are available you find the field
Digitalisat anzeigen . When you click on this field you come to the digital file in question.
Good hunting !
Best regards
Luc