Permanently remove deleted files on iCloud.com
On iCloud.com, you can immediately and permanently remove files you deleted from iCloud Drive within the last 30 days.
Go to icloud.com/iclouddrive, then sign in to your Apple Account (if necessary).
Tap Recently Deleted in the sidebar.
If you don’t see the sidebar, tap in the top-left corner.
Do one of the following:
Delete some items: Tap , choose Select, select the items you want to delete, then tap Delete at the bottom of the screen.
Delete all items: Tap Delete All at the bottom of the screen.
To go back to your other files, tap another option in the sidebar, such as Recents or Browse.