Update Doc Modified By Another Instance of Scrivener

I have a reference .RTF document with information that I keep handy in many Scrivener projects (Scrivener for Windows v1.9.16). It is rarely modified, but some changes were recently made in one project.

How do I get those changes to appear in the original Win10 .RTF doc and all copies of that doc in other projects? Do I need to delete the old doc, manually copy the info into a new doc, then add the new version to each project?

Is there an alternative to ‘sync’ the docs between projects and with a standalone doc?

Thanks for any guidance.

Best Regards,
J McManus