How to Say "annex" in Spanish
The Spanish word for “annex” is “anexo” — A2 level. This is a very common word in everyday Spanish.

Examples
Te envío el contrato en un anexo.
I am sending you the contract in an attachment.
La oficina está en el anexo del edificio principal.
The office is in the annex of the main building.
Consulta el anexo para ver la lista completa de datos.
Check the appendix to see the full list of data.
Always Masculine
When used as a naming word (noun) to mean an attachment or building, it is always 'el anexo' regardless of the object it's referring to.
Placement in Documents
Just like in English, an 'anexo' usually comes at the very end of a document or book.
Email Confusion
Mistake: “Te mando un adjunto (when referring specifically to the section name).”
Correction: While 'adjunto' is more common for the file itself, 'anexo' is used for the formal section or legal attachment.
Related Translations
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