S3: Get all files inside folders

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I want to get all the files inside of folders in s3, (files doesn’t have extension)

The structure is the following

Folder1 File1 File2 … Folder2 File3 … …

In streamsets documentation I found that using ** I can navigate inside of folders.

I have tried with prefix pattern: **/* or ** or **/ and I am getting infinite loops. Ideas?