Roovet Drive allows users to store files in the cloud, synchronize files across devices, and share files.
To get the ads free version of the app you can buy the following monthly plan within the setting page of the app.
Ads Free Plan
Price: $0.99/Month
The plan will automatically review after every month.
You can further read
Terms of Services: https://roovet.com/drive/pages/2/terms-of-service
Privacy Policy: https://roovet.com/drive/pages/1/privacy-policy
If you face any issue you can visit the https://reportaproblem.apple.com to request the refund