How to find duplicates of saved images and files on External HDD on iPadOS?

I tried doing work mainly on the iPad Pro M2, and when my iPad storage is almost full I transfer movies and photos to an external HDD for backup. Sometimes, I get to copy again the same files so I end up having duplicates on my hard drive. I could remove the duplicates using my a laptop/desktop but that feature feels like it should have been on the iPad Pro in the first place. Is there an app for this? Or is it possible to get that feature in any way using the iPad? This is frustrating…