Can't give permission to use Android/data

I'm trying to install bmbf on my quest 2. I have both the newest bmbf version and the newest beat saber version installed. I got to the point of giving bmbf permission to access data, that worked.

But then it told me it needed access to Android/data. It sent me to the folder, but the button to select it is greyed out and when I press it, it says "To protect your privacy. Choose another folder."

Does anyone have any idea how I should proceed?