Sutra ću preuzeti datoteku i priložiti je e-mailu.

Ću is the 1st person singular form of the auxiliary verb used to make the future tense in Croatian.

So:

• ja ću = I will
• sutra ću preuzeti = tomorrow I will download/take over
• (i) priložiti = (and) attach

A very common way to form the future in Croatian is:

• subject + future auxiliary + infinitive

For example:

• Ja ću doći. = I will come.
• Mi ćemo pisati. = We will write.

In your sentence, the subject ja is not stated because Croatian often leaves it out when it is clear from the verb form.

Because both infinitives are part of the same future action and share the same subject, Croatian normally uses the future auxiliary only once:

• Sutra ću preuzeti datoteku i priložiti je e-mailu.

This means:

• I will download the file and attach it to the email.

Repeating ću would usually sound unnecessary here:

• Sutra ću preuzeti datoteku i ću priložiti je e-mailu. → not natural

So one auxiliary can govern both infinitives when they are coordinated with i (and).

Datoteku is the accusative singular of datoteka (file).

It is in the accusative because it is the direct object of preuzeti:

• preuzeti što? = to download / take what?
• datoteku

Many feminine nouns ending in -a change to -u in the accusative singular:

• datoteka → datoteku
• knjiga → knjigu
• poruka → poruku

So datoteku is exactly what you would expect after a transitive verb like preuzeti.

Je here means it and refers back to datoteku (the file).

So:

• priložiti je = attach it

Croatian often uses a pronoun like this instead of repeating the noun:

• ... preuzeti datoteku i priložiti je e-mailu
• literally: ... download the file and attach it to the email

Because datoteka is a feminine noun, the accusative singular pronoun is je.

Compare:

• Vidim knjigu. → Vidim je.
  (I see the book. → I see it.)

This is about clitic placement, which is a very important feature of Croatian.

Pronouns like je, as well as forms like ću, are clitics: short unstressed words that usually go in a special position in the sentence, often near the beginning of a clause or immediately after the first stressed element of their part of the sentence.

In a simple sentence, you often see:

• Sutra ću...

Here ću is in the normal clitic position after sutra.

In the second coordinated part:

• i priložiti je e-mailu

the pronoun je follows the infinitive naturally in this structure.

Learners often want to place pronouns exactly as in English, but Croatian clitic order follows its own rules, not English word order.

Because e-mailu is in the dative singular.

The verb priložiti often takes:

• the thing being attached in the accusative
• the thing it is attached to in the dative

So:

• priložiti što komu/čemu
• attach what to whom/to what

In this sentence:

• je = it = the file → accusative
• e-mailu = to the email → dative

So the structure is:

• priložiti je e-mailu = attach it to the email

This dative ending is very common with masculine nouns:

• e-mail → e-mailu
• dokument → dokumentu
• račun → računu

Sometimes Croatian allows different expressions depending on nuance, but with priložiti the dative construction is standard and natural:

• priložiti datoteku e-mailu
• priložiti je e-mailu

This is the most grammar-driven form.

In everyday speech, many speakers may phrase the whole idea differently, for example:

• poslati datoteku u privitku e-maila
• attach/send the file as an email attachment

But in the sentence you were given, e-mailu is the correct and expected form after priložiti.

In this context, yes, preuzeti can mean download.

More literally, preuzeti can mean things like:

• take over
• take on
• collect
• pick up
• download

The exact meaning depends on context.

With datoteku (file), the meaning is naturally:

• preuzeti datoteku = download a file

In everyday computer language, learners may also hear skinuti datoteku for download a file, but preuzeti is standard and often more neutral/formal.

Yes, both preuzeti and priložiti are infinitives.

In Croatian, after the future auxiliary ću, you commonly use the infinitive:

• ću preuzeti
• ću priložiti

So the pattern is:

• ću + infinitive

That is why the verbs do not change for person here; the person is already shown by ću.

They are perfective verbs.

That matters because Croatian aspect is very important. Perfective verbs usually express:

• a completed action
• a single whole event
• a result

In this sentence, that fits perfectly:

• preuzeti datoteku = download the file as a completed action
• priložiti je e-mailu = attach it as a completed action

Since the sentence talks about what will happen tomorrow as completed tasks, perfective verbs are natural here.

Very roughly:

• preuzimati / prilagati (imperfective) = the process / repeated action
• preuzeti / priložiti (perfective) = the completed act

Croatian often drops subject pronouns when the meaning is already clear from the verb form.

Here ću already tells you the subject is I:

• ću = I will

So:

• Sutra ću preuzeti datoteku... already means
• Tomorrow I will download the file...

You could say Ja ću..., but that usually adds emphasis:

• Ja ću preuzeti datoteku. = I will download the file.
  (perhaps not someone else)

Without emphasis, leaving out ja is more natural.

Croatian word order is more flexible than English, but it is not random.

The given sentence is natural:

• Sutra ću preuzeti datoteku i priložiti je e-mailu.

You may also see variations depending on emphasis, for example:

• Datoteku ću sutra preuzeti i priložiti je e-mailu.
• Sutra ću datoteku preuzeti i priložiti je e-mailu.

But not every possible order sounds equally natural. The main restrictions involve clitics like ću and je, which must appear in specific positions.

So yes, word order can shift for focus, but the original version is a very normal neutral sentence.

Yes. Sutra means tomorrow and functions as an adverb of time.

It tells you when the action will happen:

• Sutra ću preuzeti datoteku... = Tomorrow I will download the file...

Because it comes first, it also helps set the time frame for the whole sentence. That is one reason why ću appears right after it.

The original sentence is grammatical and clear. In real-life computer/email contexts, speakers might also say something like:

• Sutra ću preuzeti datoteku i priložiti je poruci e-pošte.
• Sutra ću preuzeti datoteku i poslati je u privitku e-maila.

Why? Because when talking about email attachments, Croatian often uses expressions involving:

• privitak = attachment
• u privitku = as an attachment / in attachment form

Still, your original sentence is perfectly understandable and useful for learning grammar.