Same Rule for different files in subfolder

Hello

I have a lot of school videos in folders and they need to be renumberd with Zeros in front of them
What i figured out is how to make a 1. Start to an 01. Start

But my folder Structure looks like this:

1. Chapter 1
-1. Start.mp4
-2. chapter1Next.mp4
-15.chapter1Next.mp4
2. Chapter 1
-1. Start.mp4
-2. chapter2Next.mp4
-18.chapter2Next.mp4

-- If i renumber them the numbers those in chapter 2 are subsequent to chapter 1
(like 28.chapter2Next.mp4)

Right now i have to drag&drop every single folder and press "start batch"

Is there an easier way to do this?

Thanks

Reply to #1:
I figured it out just if someone else needs this:
-Choose Renumber
-Then Changes are relative to existing number
-zero padding: manual