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How to manage deleted files on iOS, iPadOS, and macOS
You can delete your iPhone files permanently — if you know how.
Most of the time when you delete a file, it’s actually not wiped from existence immediately — as recently discovered by a man whose wife came across illicit texts he’d been sending (and which he thought he had got rid of on his iPhone). To bring back or wipe individual files, select them as needed, and the Recover and Delete buttons will become active in the top-right corner. Finally, bear in mind that other apps across the Apple ecosystem have their own folders of recently deleted items, usually with the same 30-day time limit.
Or read this on The Verge