anexar

To attach or append something to a document, email, or larger whole — anexar un archivo, anexar un anexo al contrato. It's the everyday word for attaching files and documents, distinct from anexionar, which is reserved for the political act of annexing territory.

• Voy a anexar el currículum al correo. — I'm going to attach my résumé to the email.
• Anexaron los planos originales al informe final. — They attached the original blueprints to the final report.
• Puedes anexar cualquier documento adicional a la solicitud. — You can attach any additional document to the application.

Using anexar for a country annexing land — that's anexionar; anexar is for attaching files and documents, not territory.

Often confused with anexionar.