Pages Help Combining Documents

I have started using pages and seem unable to combine two documents.

If I have them open side by side why can’t I drag one thumbnail from one document to another or copy a thumbnail and paste it in another document.

This seems something that should be straight forward so I am obviously doing something stupid.

You can drag and drop objects and text within a document or between documents. AFAIK, you cannot drag pages either within a document or between documents.

Of course, what you can do is copy and paste the text from one document to another. But because it’s not a PDF, you can’t grab a whole page because a page doesn’t have a unique meaning in Pages. A page is simply the holder of a certain amount of text, and any changes to the doc will change the flow of the text. IMHO.