Thanks for writing in!
...but now the copyright, links, and social media icons are gone even though I see them all in my footer page backend
- This is because
the copyright, links, and social media icons is the default footer layout. When you create a custom footer and assign it globally, the default footer will be removed and replaced with the custom footer instead. You will need to create more bars to your custom footer instead to add the missing elements. You can add another bar for the copyright text and links and so on.
Hope this explains it briefly.