This time, it was only happening with Word docs, previously it has happened with excel files. I attached a word doc from an older version, this was .doc, not .docx. When I attempted to open the attached document later, EN notified me that it had imported the document, creating a new note with a new attachment in my default folder. After changing the default app back to Word, the situation resolved. Just still not sure why the default app would change in the first place. Sorry, I fixed it before creating screenshots.