Hello @MaryLynneM9 ,
Documents can be linked to in emails. If the file you're trying to "attach" isn't a file type accepted in the Library, or is too large, you'd need to host the file elsewhere (such as a cloud drive), and link to the external document's share URL as provided by the host.
See also:
Inserting text links
Inserting image links
Inserting button links
... View more
