the scripting part is where things get complicated real fast, there are different approaches to solve this problem, and it changes depending on how you organized the files, so you might want to search around to see what other people do if I don't explain it well.

The way I would solve this is, generating a list of files, then using a batch script to run a command on each item in the list, since 'upscayl-bin.exe' says input only accepts webp, jpg, and png, I'll search for those three, in my example 'images' is a directory that has 3 sub folders (set1, set2, set3) each of those has image files

`dir /b /s *.jpg *.png *.webp`
will search the current directory, and sub directories for all files ending with those extensions
``>> list.txt`` saves the output of the previous command, into a file named list.txt