iCloud Drive stuck

Did you tap on the Upgrade button? iCloud Drive is now the Files app. I believe that is what it wants to upgrade to. See the "Use iCloud Drive on your iPhone, iPad, iPod touch, Mac, or PC" section in:

Access iCloud Drive files from your iPhone and other devices - Apple Support

Have you tried restarting the device?

What about signing out of it and back in?

Next step -- Get Support.