many inputs in a folder

Hello,
in the "Text file input" step I'm trying to set the input as a folder, where I have the input files. I want to transform all input files in a folder without changing the input manually.
All files are in the folder C:\Users\David\Desktop\Example\Vstup

In the "Text file input" step i set a path to C:\Users\David\Desktop\Example\Vstup\*.txt but it does not work.
Thanks