How to Make Every Page Have a Different Footer – Google Docs Editors …

To have different footers, put a section break — Insert > Break > Section break (next page) — at the end of each page. Remove all the footers and page numbers you have already entered. Start the process over by inserting the section breaks and also UN-check the box in the footer for link to previous.

https://support.google.com/docs/thread/255027624/how-to-make-every-page-have-a-different-footer?hl=en