cheombupairi neomu keoseo jeojanggonggani geoui eobseo.

첨부파일 means attached file or attachment, such as a file attached to an email, message, or form.

It is made of:

• 첨부 = attachment / attaching
• 파일 = file

So 첨부파일 is literally attachment file, but in natural English we usually just say attachment or attached file.

이 is the subject particle. It marks 첨부파일 as the thing being described.

So:

• 첨부파일이 너무 커서... = As for / because the attached file is too big...

Here, the sentence is talking about the attachment’s size and then explaining the result: there is almost no storage space.

Because 첨부파일 ends in a consonant sound, the subject particle is 이 rather than 가.

Here, 너무 means too.

In this sentence:

• 너무 커서 = because it is too big

That fits because there is a negative consequence afterward: there is almost no storage space.

In everyday Korean, 너무 is also often used informally to mean very, especially in speech:

• 너무 예뻐요 = so pretty / very pretty

But in this sentence, because it leads to a problem, too is the better interpretation.

커서 comes from the adjective 크다 (to be big) plus -어서, which often means because, so, or connects one action/state to the next.

Formation:

• 크다
• remove 다 → 크-
• add -어서
• but 크어서 contracts to 커서

So:

• 커서 = because it is big / being big, ...

In this sentence:

• 너무 커서 저장공간이 거의 없어 = Because it is too big, there is almost no storage space.

This is due to a common contraction pattern.

With 크다:

• stem: 크-
• • -어서
• expected form: 크어서
• actual natural form: 커서

This happens because Korean often contracts vowel combinations into smoother forms.

You will see similar patterns with other ㅡ-stem words:

• 바쁘다 → 바빠서
• 슬프다 → 슬퍼서
• 크다 → 커서

So 커서 is simply the natural contracted form.

Not always. -아서/어서 can have a few related uses, including:

1. Cause / reason

   • 비가 와서 못 갔어요.
   • I couldn’t go because it rained.

2. Sequence / connection

   • 가게에 가서 빵을 샀어요.
   • I went to the store and bought bread.

In your sentence, 커서 is clearly giving a reason:

• The attached file is too big, so / because of that, there is almost no storage space.

Both can express a reason, but the nuance is a little different.

• 커서 sounds like a more natural, flowing explanation of cause and result.
• 크니까 can sound a bit more direct, explanatory, or sometimes more like the speaker is pointing out the reason explicitly.

Compare:

• 첨부파일이 너무 커서 저장공간이 거의 없어.
  • natural statement of cause and result
• 첨부파일이 너무 크니까 저장공간이 거의 없어.
  • also possible, but slightly more pointed or explanatory

In many everyday situations, -어서 feels smoother for simple factual cause-and-effect statements like this one.

저장공간 means storage space.

It is made of:

• 저장 = storage / saving
• 공간 = space

So together:

• 저장공간 = storage space, such as on a phone, computer, app, or cloud service

This is a common word in tech-related situations.

거의 없어 means there is almost none or there is hardly any.

Breakdown:

• 거의 = almost / nearly
• 없어 = there isn’t / there is no / do not have

So:

• 저장공간이 거의 없어 = There is almost no storage space = There is hardly any storage space left

In natural English, people often translate this more smoothly as:

• I’m almost out of storage space
• There’s barely any storage space left

This is a matter of speech level.

• 없다 = dictionary form
• 없어 = informal plain/casual speech
• 없어요 = polite speech

So the sentence:

• 첨부파일이 너무 커서 저장공간이 거의 없어.

is in a casual style, which you might use with friends, in text messages, or in informal narration.

Polite version:

• 첨부파일이 너무 커서 저장공간이 거의 없어요.

Dictionary-form style:

• 첨부파일이 너무 커서 저장공간이 거의 없다.

Yes, Korean often leaves out subjects when they are understood from context.

This sentence does not explicitly say:

• I
• my device
• my account
• my email

But English usually needs to make that clearer depending on context.

Possible natural English translations could be:

• The attachment is too big, so I’m almost out of storage space.
• The attachment is too big, so there’s almost no storage space left.
• The attached file is so big that there’s barely any storage space.

Korean often lets the context tell you whose storage space it is.

Grammatically, 첨부파일 by itself does not clearly mark singular vs. plural. Korean often leaves that to context.

So it could mean:

• the attached file
• the attachment
• sometimes even attached files, if the context supports that

However, in this sentence, most people would naturally read it as a single attached file unless the surrounding context suggests multiple files.

If you wanted to make plural explicit, you could use:

• 첨부파일들 = attached files

But Korean often avoids plural marking unless needed.

That is a good observation. The sentence is understandable, but depending on the context, it can sound slightly compressed or context-dependent.

It may mean something like:

• The attachment is so big that there’s barely any storage space left
• Because the attached file is too large, there’s almost no storage space available

In real life, speakers sometimes state the result a bit loosely. A more explicit version could be:

• 첨부파일이 너무 커서 저장공간이 부족해.
  • The attachment is too big, so there isn’t enough storage space.

or

• 첨부파일이 너무 커서 저장공간이 거의 남아 있지 않아.
  • The attachment is too big, so there’s almost no storage space left.

So the original is understandable, but other versions may sound a bit more precise.

A polite version would be:

• 첨부파일이 너무 커서 저장공간이 거의 없어요.

Only the ending changes:

• 없어 → 없어요

If you wanted a more formal or written style, you could say:

• 첨부파일이 너무 커서 저장공간이 거의 없습니다.

So the levels are:

• casual: 없어
• polite: 없어요
• formal: 없습니다