Qual a diferença Attach x Annex

Olá Pessoal ,

Para anexar algum documento e enviar por email, sei que é comum usar attach.

E no caso de Annex?

Quando usar as palavras attach e Annex?
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Hi Rennan,

To attach or add, esp. to something larger or more important:annexed a building to their headquarters.
To take control of (territory) from another country, often by force: Germany annexed Czechoslovakia.

Although annex an attach can be similar, I would say the usage of the latter is significantly more frequent. The word "annex" is more formal, common in books, specially titles or indexes.
See more uses of annex below:

Annex something (formal) to take control of a country, region, etc.
Germany annexed Austria in 1938.
The territory had been annexed to Poland.
(annex is very common in this context ;) )
from: WordReference Dictionary

1. To append or attach, especially to a larger or more significant thing.
2. To incorporate (territory) into an existing political unit such as a country, state, county, or city.
3. To add or attach, as an attribute, condition, or consequence.
from: The Free Dictionary

Attach you can use in everyday conversation without being too formal.
Fasten/join: He made certain that the trailer was securely attached to the van.
Fasten (a related document) to another, or to an email:
I attach a copy of the memo for your information
Include (a condition) as part of an agreement:
The Commission can attach appropriate conditions to the operation of the agreement.
Attach oneself - to Join (someone or something):
Without being invited: they were all too ready to attach themselves to you for the whole day.
from: Oxford Learner's Dictionary.
I hope it can help a little bit... :lol:

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