Select text as the user input type > update the input name and input value placeholder text. This user input type will be used to allow users to enter the site URL they wish to copy their pages to.

Add a get file properties action and configure with the following:

Enter the source site address of your site pages library

Enter either site pages, or the ID of your site pages library Under ID > select ID from the for a selected file trigger

Add a copy file action and configure with the following:

Current site address: source site address of your site pages library

File to copy: Identifier from get file properties

Destination site address: destination site (or whatever you called your user input) from for a selected file

Destination folder: /SitePages

If another file is already there: copy with a new name (optional)