This is the 8775th most frequent Portuguese word.
anexo
Attached or annexed; an attachment or addendum.
Here, 'anexo' is used as an adverb to indicate that the report was sent attached to the email.
Enviei o relatório em anexo por e-mail.
I sent the report as an attachment via email.
In this sentence, 'anexo' acts as an adverb describing that the document is sent in an attached form.
Segue anexo o documento solicitado.
Attached is the requested document.
Here, 'anexa,' derived from 'anexo,' is used as an adjective referring to the room being adjacent or connected to the office.