Verify files in SD have been copied

[Agustin Lobo]

I copy photos from the SD card to an external drive and organize them
in folders.
Quite often, I do not immediately delete from the SD those photos that
have been copied to the external drive
and then, when I need to reuse the SD, I doubt about the photos having
been copied.
Is there a tool in digikam to list those photos in the SD that are not
present in any folder of an external drive?

Agus