בסוף שלחתי מסמך רשמי עם הקובץ המצורף, וקיבלתי תשובה סופית עוד באותו יום.

Here בסוף means in the end / finally / eventually.

So בסוף שלחתי... is like saying:

• In the end, I sent...
• Eventually, I sent...
• I finally sent...

Literally, בסוף can also mean at the end, depending on context. For example:

• בסוף היום = at the end of the day

But in your sentence, it clearly has the more idiomatic sense of finally / after all that.

A close alternative is לבסוף, which is slightly more formal.

שלחתי is the past tense, first person singular form of the verb לשלוח (to send).

Breakdown:

• root: ש-ל-ח
• base past form: שלח
• -תי = I in the past tense

So:

• שלחתי = I sent

Other examples:

• שלחת = you sent (masculine singular)
• שלחתי? No — that would be incorrect
• שלחה = she sent
• שלחו = they sent

The same pattern appears in קיבלתי = I received.

Because את marks a definite direct object, and מסמך רשמי here is indefinite.

• מסמך רשמי = an official document
• not the official document

So:

• שלחתי מסמך רשמי = I sent an official document

But if it were definite, you would say:

• שלחתי את המסמך הרשמי = I sent the official document

This is a very common rule in Hebrew:

• use את with definite direct objects
• do not use את with indefinite ones

Because in Hebrew, adjectives usually come after the noun they describe.

So:

• מסמך = document
• רשמי = official
• מסמך רשמי = official document

This is the normal Hebrew word order:

• בית גדול = big house
• מכתב ארוך = long letter
• תשובה סופית = final answer

Also, the adjective must agree with the noun in:

• gender
• number
• definiteness

Here:

• מסמך is masculine singular
• so the adjective is רשמי, also masculine singular

Literally, it means with the attached file.

Breakdown:

• עם = with
• הקובץ = the file
• המצורף = the attached / enclosed

So the phrase means that the document was sent together with that file.

In natural English, depending on context, this could correspond to:

• with the attached file
• along with the attached file
• sometimes just with the attachment

Because in Hebrew, when a noun is definite, its adjective usually becomes definite too.

So:

• קובץ מצורף = an attached file
• הקובץ המצורף = the attached file

Both parts take the definite article:

• הקובץ = the file
• המצורף = the attached

This matching is very important in Hebrew.

Compare:

• מסמך רשמי = an official document
• המסמך הרשמי = the official document

You normally would not say:

• הקובץ מצורף to mean the attached file

That would sound incomplete or ungrammatical in this structure.

In this sentence, מצורף functions like an adjective, but historically/grammatically it is a passive participle.

It comes from the verb לצרף = to attach / to add / to enclose.

So:

• קובץ מצורף = an attached file
• literally: a file that is attached

This kind of participle is very common in Hebrew and often behaves just like an adjective.

Similar examples:

• מכתב כתוב = a written letter
• דלת סגורה = a closed door
• אישור חתום = a signed confirmation

So for a learner, it is often easiest to treat מצורף here as attached.

Here ו־ simply means and.

So:

• שלחתי = I sent
• וקיבלתי = and I received

In modern Hebrew, ו־ does not normally change the tense. It just connects clauses.

So the sentence structure is straightforward:

• בסוף שלחתי...
• וקיבלתי...

=
In the end I sent..., and I received...

You may hear about older Biblical Hebrew uses where ו can affect tense, but that is not what is happening here.

תשובה סופית means a final answer or a definitive response.

Why סופית? Because תשובה is a feminine singular noun, and the adjective must agree with it.

So:

• תשובה = feminine singular
• סופית = feminine singular adjective form of סופי (final)

Compare:

• מסמך סופי = a final document (masculine)
• תשובה סופית = a final answer (feminine)

Again, Hebrew adjectives usually come after the noun.

עוד באותו יום means something like:

• later that same day
• still on that same day
• as early as that same day
• often in context: already that same day

The exact nuance of עוד depends on context. It is a flexible word.

In this sentence, it emphasizes how quickly the answer arrived:

• וקיבלתי תשובה סופית עוד באותו יום
• and I received a final answer that very same day

So עוד adds the sense of surprisingly soon / already / still within that day.

Very often, English translators render this naturally rather than literally.

באותו יום literally means on that same day.

Breakdown:

• ב־ = in / on
• אותו = that same / that very (masculine singular here)
• יום = day

So:

• באותו יום = on that same day

Why אותו? Because יום is masculine singular.

Compare:

• באותה שעה = at that same hour / at that very hour
• באותו רגע = at that same moment

This is a very useful pattern in Hebrew.

The comma separates two linked actions:

1. בסוף שלחתי מסמך רשמי עם הקובץ המצורף
2. וקיבלתי תשובה סופית עוד באותו יום

In English, you might also write:

• In the end, I sent an official document with the attached file, and I received a final answer that same day.

Hebrew punctuation is often fairly similar to English in sentences like this. The comma helps show a pause between the two main clauses.

That said, punctuation in Hebrew can be somewhat flexible, and in less formal writing some people might omit the comma. The grammar of the sentence does not depend on it.