Open saved tab group in existing Safari window

iPad Pro (12.9-inch) (5th generation), 17.6.1.

I have a saved group of tabs from a few days ago. If I open (select) that group, it opens a new Safari window with all of those tabs and closes whatever other Safari window is open. If I subsequently click on a link outside of Safari, like a link in email, it closes the Safari window with all the open tabs, and opens a new Safari window with one tab containing the link destination. I can reproduce this every time. So, how can I copy all of the links in the saved group and open them in the ‘new’ Safari window with only one tab. If I hold down on the saved tab group, a menu appears and one of the options is ‘copy links’. I would have thought this could be pasted into an existing (open) Safari window, but I can’t figure out how.

Thanks