Data recovery from iOS devices is generally more complicated than a regular Mac file recovery
process. When Disk Drill scans your iOS device for lost data directly, it creates an invisible iTunes backup file that has all the device's databases in it. Then Disk Drill runs its own iOS data recovery tools to rebuild your iOS files and data structures to list with everything recoverable.
The same iOS data recovery process takes place when an existing iTunes backup is analyzed by Disk Drill.