NordLocker Cloud Storage (Old)

How can we change to dark theme More I find that my phone setting is using drak theme and in app the left panel is dark but main part (browsing file)is white

I uploaded some txt file to the locker. But when I downloaded the txt files, they all became html format and can't be read. All text content lost. Very disappointed. Several days later, I tried again and could download the txt files successfully. Please ensure the app stability onwards. Weeks later, the same problem reappear. Very disappointed.