Exclamation Restoring Nandroid: Files not found

I'm trying to restore a nandroid backup from my external SD card and have run into some problems. I'm using Philz Touch recovery; went to restore my backup and it said "No files found"" when I tapped it. So I created a new nandroid backup to see where the files might be located, and the new nandroid backup is located in the exact same place that the old one was (on the External SD card under ClockworkRecovery/backup). There's a Clockwork backup directory on my Galaxy s4's internal storage, but there are no backup files there.

Any ideas on how to restore?