Looping Through Sub-Folders

Is there an easy way to loop through a directory of subfolders and do the same thing inside each subfolder? The activities inside each subfolder would include reading PDFs and producing outputs.

If not in UiPath, is there a simple script I could use or write in another place? Does anyone have any suggestions? Thanks

Simplest way of doing it by using

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What would this return to me?

Array of string.
With all pdf files are stored in this particular directory or sub directory.