Утром я отправил запрос в техподдержку, потому что не смог открыть вложение.

Утром is the instrumental singular of утро (morning), and Russian often uses the instrumental case as an adverb of time.

So:

• утром = in the morning
• днём = in the daytime / during the day
• вечером = in the evening
• ночью = at night

This is a very common pattern, and no preposition is needed.

So:

• Утром я отправил запрос... = In the morning, I sent a request...

A different expression is also possible:

• с утра = since early morning / from the morning onward
• по утрам = in the mornings (habitually)

But in this sentence, утром is the normal way to say in the morning for one specific occasion.

Yes, Russian can sometimes omit subject pronouns, but here я is very natural and often helpful.

In the present tense, verb endings usually show the person clearly:

• я пишу = I write
• ты пишешь = you write

So the pronoun is often dropped.

But in the past tense, Russian verbs show gender and number, not person:

• отправил = could mean I sent or he sent (if masculine)
• отправила = could mean I sent or she sent (if feminine)

Because of that, я is often included in past-tense sentences to make the subject clear.

So:

• Утром я отправил запрос... = clear and neutral
• Утром отправил запрос... = possible in context, but more conversational and less explicit

Отправил is the past tense, masculine singular form of отправить.

It tells you:

• the action is in the past
• the subject is singular
• the speaker or subject is masculine

So if the speaker is male:

• я отправил = I sent

If the speaker is female, it would be:

• я отправила

Other forms:

• он отправил = he sent
• она отправила = she sent
• мы отправили = we sent

This is one of the first things English speakers notice about Russian past tense: it agrees with gender, which English does not do.

This is an aspect question.

• отправить → perfective
• отправлять → imperfective

Here, отправил is used because the sentence refers to a completed action: the request was sent successfully as one whole event.

• Утром я отправил запрос... = In the morning I sent a request...
  The action is presented as completed.

If you said:

• Утром я отправлял запрос...

that would sound different. It could suggest:

• the process of sending
• repeated attempts
• background description rather than a completed result

So in this sentence, отправил is the natural choice because the point is that the request was sent.

Not exactly.

Запрос usually means something like:

• request
• query
• inquiry
• sometimes support request / ticket

It is not usually the everyday word for a simple spoken question.

Compare:

• вопрос = question
• запрос = request / formal inquiry / submitted query

In a tech-support context, запрос sounds natural because it suggests an official or semi-official request for help.

So:

• отправил запрос в техподдержку = sent a support request to tech support

Because в can take different cases depending on meaning:

• в + accusative = into / to / toward a destination
• в + prepositional = in / inside / at a location

Here, в техподдержку means something like to tech support, treating tech support as the destination of the request.

So:

• отправить запрос в техподдержку = to send a request to tech support

Compare:

• в офис = to the office
• в офисе = in the office

Even though tech support is not a physical place in this sentence, Russian still uses the same destination logic.

Техподдержка is very common and natural, but it is somewhat compressed and slightly less formal than the full version.

It comes from:

• техническая поддержка = technical support

Common alternatives:

• в техподдержку = to tech support
• в службу поддержки = to the support service / support department
• в техническую поддержку = a fuller, more formal version

So техподдержка is normal in everyday and workplace Russian, especially in IT or customer-service contexts.

Because потому что introduces a subordinate clause, and Russian normally puts a comma before it.

Main clause:

• Утром я отправил запрос в техподдержку

Subordinate clause giving the reason:

• потому что не смог открыть вложение

So the comma marks the boundary between:

• what happened
• why it happened

This is standard Russian punctuation.

This is another very important aspect/meaning distinction.

• не смог открыть = was not able to open / couldn’t open
  This focuses on the result: the attempt failed in that specific situation.
• не мог открыть = could not open / was unable to open
  This can sound more like a state, ongoing inability, or background description.

In this sentence, не смог открыть is very natural because it refers to one concrete failed action: the person tried to open the attachment and failed.

So:

• потому что не смог открыть вложение = because I couldn’t open the attachment

If you used не мог открыть, it might sound more like:

• I was unable to open it for some period of time
• something prevented me from opening it

Both are possible in some contexts, but не смог открыть is the most straightforward choice for a single failed attempt.

Вложение is the direct object of открыть, so it is in the accusative case.

However, for an inanimate neuter noun like вложение, the accusative form looks the same as the nominative:

• nominative: вложение
• accusative: вложение

So the form does not change, even though the case function does.

In this context, вложение means:

• attachment
• usually an email attachment or attached file

A more everyday alternative could be:

• прикреплённый файл = attached file

But вложение is very common in email and office/technical language.

Yes. Russian word order is flexible, and different orders create different emphasis.

The sentence as given:

• Утром я отправил запрос в техподдержку, потому что не смог открыть вложение.

This is neutral and natural. It begins with утром, which sets the time right away.

Other possible versions:

• Я утром отправил запрос в техподдержку...
• Запрос в техподдержку я отправил утром...
• Потому что не смог открыть вложение, я утром отправил запрос в техподдержку.

These are all grammatically possible, but the emphasis changes.

For example:

• starting with утром highlights the time
• starting with я highlights the subject
• starting with запрос highlights the request itself

So Russian word order is not random, but it is much freer than English.

Because смочь means to be able / to manage, and it is normally followed by an infinitive describing the action that was or was not possible.

So:

• смог открыть = managed to open / was able to open
• не смог открыть = couldn’t open / was not able to open

This is a very common pattern:

• смог понять = managed to understand
• смог найти = managed to find
• не смог войти = couldn’t enter / log in

So in this sentence:

• не смог открыть вложение literally means did not manage to open the attachment

Yes, it sounds natural.

A native speaker might also say things like:

• Утром я отправил запрос в техподдержку, потому что не смог открыть файл-вложение.
• Утром я написал в техподдержку, потому что не смог открыть вложение.
• Утром я обратился в техподдержку, потому что не смог открыть вложение.

The differences are small:

• отправил запрос = sent a request
• написал в техподдержку = wrote to tech support
• обратился в техподдержку = contacted tech support / turned to tech support

But the original sentence is perfectly normal and idiomatic.