You can implement this File Explorer into your app. I adapted the paths to your ASD. It only displays pdf files and folders and is limited to the "kundc" folder, where you downloading folders and files to.
FileExplorer.aia (87.7 KB)
You need to add these extensions:
https://puravidaapps.com/file.php
https://aix.colintree.cn/en/extensions/ColinTreeListView.html
You also need to pull icons from resources and add them to your app.