Hi,
Firstly thank you so much for actually having a picture and a clear explanation, like no sarcasm at all.
So the issue is, the ID is a SharePoint column and you CANNOT write into it.
So in the list your want to write too, you need to add a custom column and call it like OldID and then put the ID value you brought without Get Items from the original list there.
Then after you do the Create Item
You can immediately grab the new ID created from that Action, which is now the one you want to put in your 2nd Document library.
So as you loop through the Old List items, you need to create their item in the new place first, and then use the generated ID from that Action to write your files or whatever to the document library column
But again, you cannot write to the ID column you will need to use a custom column to store it.
If this answered your question please mark it as such.