Moving files

I’m attempting to move a bunch of images from my Mac to an external hard drive. I “grab” all the files and drag them over to the other folder and I get a prompt that says some file names already exist. I get the question if I want to skip, stop, or replace the file. But when I only move a small amount of about 5-10 images the question I get is keep both, stop, or replace. I would prefer to always keep both. Is there anyway I can move that large number of files and always keep both?