How do I edit multiple images at once in Photoshop?

How do I edit multiple images at once in Photoshop?

Below is an example of loading multiple image files at once and editing them at once. In my case, I would like to show you how to batch-change image files from RGB to CMYK, a printing mode.

1. Go to the File ---> Scripts---> Load Files into Stack.

2. Through the Browse button, you can open your all images, which you want to edit at once. 

In my case, I would like to change the mode like below. 

For mode changing, I clicked the 'don't merge' button. 

After changing the mode, I moved File---> Export---> Layers to Files. 

​Save the file as a JPG file in the designated location.

In my case, I converted all images to PDF.