Microsoft finally brings OneDrive for Android on par with iOS app
back in September but didn't say anything about the Android version.
We're still not convinced that a wider rollout has begun, but, as per MundoInsider, users in Europe report the latest update adds a dark theme. The new native dark mode can be enabled from the Settings menu by clicking the Theme option. You'll have the option to choose from three possible themes: Light, Dark and System Default.
Make sure that you select System Default if you're using dark mode as the default theme of your Android smartphone. Otherwise, you can choose whichever of the three options you wish. The new dark theme seems to be available in OneDrive for Android v6.0, but we're not sure it's already been uploaded to Google Play Store for everyone to download yet.