Wysyłam dokument poprzez aplikację.

Wysyłam is the 1st person singular present-tense form of wysyłać.

So it tells you:

• who is doing the action: I
• when: present time
• verb type: it comes from an imperfective verb

In English, it can match both:

• I am sending
• I send

The exact interpretation depends on context.

Polish usually does not use subject pronouns unless they are needed for emphasis, contrast, or clarity.

That is because the verb ending already shows the subject:

• wysyłam = I send / I am sending

So Ja wysyłam dokument poprzez aplikację is possible, but it sounds more emphatic, like:

• I am sending the document via the app
• It is I who am sending it

The sentence without ja is the normal neutral version.

Because dokument is the direct object of the verb wysyłam, so it is in the accusative case.

But for many masculine inanimate singular nouns in Polish, the accusative looks exactly the same as the nominative.

So:

• nominative: dokument
• accusative: dokument

That is why the form does not change here.

Because after poprzez, the noun goes into the accusative case, and aplikacja is a feminine singular noun.

For many feminine nouns ending in -a, the accusative singular changes like this:

• -a → -ę

So:

• nominative: aplikacja
• accusative: aplikację

That is why the sentence has poprzez aplikację.

Poprzez normally takes the accusative.

So in this sentence:

• poprzez aplikację
• not poprzez aplikacja

This is why the noun changes form.

A very useful pattern to remember is:

• poprzez + accusative

Polish has no articles, so there is no separate word for a/an or the.

That means:

• dokument can mean a document or the document
• aplikację can mean an app or the app

Context tells you which meaning is intended.

If Polish wants to be more specific, it can use other words, for example:

• ten dokument = this document / the specific document
• ta aplikacja = this app

But in many sentences, no extra word is needed.

Yes, przez aplikację would also work in many everyday contexts.

The difference is mainly stylistic:

• poprzez aplikację can sound a bit more formal or official
• przez aplikację often sounds more everyday and conversational

Both are understandable. Depending on the situation, Polish speakers might also say:

• za pomocą aplikacji = using the app / by means of the app

So the original sentence is correct, but it is slightly more formal in tone.

Yes. Polish word order is more flexible than English because the endings show the grammatical roles.

The neutral order here is:

• Wysyłam dokument poprzez aplikację.

But you could also say:

• Dokument wysyłam poprzez aplikację.
• Poprzez aplikację wysyłam dokument.

These alternatives change the focus or emphasis, not the basic meaning.

As a learner, the original version is a very good default word order.

This is a question about aspect, which is very important in Polish.

• wysyłam comes from wysyłać and is imperfective
• wyślę comes from wysłać and is perfective

Very roughly:

• wysyłam focuses on the process, repetition, or present action
• wyślę usually refers to a single completed future action

So:

• Wysyłam dokument poprzez aplikację. = I am sending / I send the document via the app
• Wyślę dokument poprzez aplikację. = I will send the document via the app

Polish does not normally use a perfective verb in the present tense to mean a present action. A form like wyślę is understood as future.

The dictionary forms are:

• wysyłać = the infinitive behind wysyłam
• dokument = already in dictionary form
• poprzez = preposition
• aplikacja = the dictionary form behind aplikację

This is useful because when you look words up, you usually need the dictionary form, not the form that appears in the sentence.