Kustom apps will not open Files by Google app

I recently got a new phone and am transferrering my widgets and wallpaper over. However, I am unable to select a working directory.
If I press the “Select Folder” button, it goes to a grey screen and does nothing. Interestingly, going through the app settings instead goes to a blank screen and kicks me back.

are you sure files app wasn’t disabled?

Yes, the files app was active and I could open it manually.

This can sometimes happen when running the app on a stripped-down version of Android like in-car media units.

maybe try downgrading files app (uninstall all updates) from app info page of files app then try?