There’s nothing more disturbing than finding files on your hardware that come from an app you are sure you never installed.
Macworld reader Kevin wrote in asking about a video-management app. It’s an app he is positive he never installed on his iOS device, and he was shocked to find a folder in the iCloud Storage view in iOS (Settings > account name > iCloud > Manage Storage).
He noted that the information seemed quite personal, as it had images that seemed to represent all his network devices. I suggested this might be something related to an app he purchased and forgot, but the explanation Kevin uncovered is only slightly related.