Deleting files

Portable Drives My Passport
1

I found I have duplicate files that are filling up “My Passport” Drive. If I retrieve them it keeps them on the drive and makes copies for me. If I use window explorer these files don’t show up. How do I get rid of them?

2

Hi, which software are you using to backup your computer?

3

Thanks for the reply
I am using WD smartware 2.4.16