Antes de submeteres o relatório, consulta o dossiê azul e os separadores do projeto.

Because this is the personal infinitive, a very common feature in Portuguese.

After antes de, Portuguese often uses an infinitive form that shows who is doing the action. Here, the implied subject is tu, so:

• submeter = basic infinitive, to submit
• submeteres = personal infinitive for tu, for you to submit / before you submit

So Antes de submeteres o relatório means Before you submit the report.

Yes. The sentence is clearly speaking to tu.

You can tell from two forms:

• submeteres = personal infinitive for tu
• consulta = affirmative imperative for tu

So this is an informal singular instruction, the kind you would use with one person you address as tu.

Because consulta here is a command, not a normal statement.

With tu, the affirmative imperative of most -ar verbs is formed by taking the tu present form and removing the final -s:

• tu consultas = you consult
• consulta! = consult! / check!

So:

• Tu consultas o dossiê. = You consult the dossier.
• Consulta o dossiê. = Consult the dossier. / Check the dossier.

It would change quite a bit, because the verb forms would no longer be the tu forms.

For você:

• Antes de submeter o relatório, consulte o dossiê azul e os separadores do projeto.

For vocês:

• Antes de submeterem o relatório, consultem o dossiê azul e os separadores do projeto.

Notice:

• tu → submeteres, consulta
• você → submeter, consulte
• vocês → submeterem, consultem

Because Portuguese uses definite articles much more often than English.

In English, you might say:

• submit the report
• check the blue folder and the project dividers

or sometimes even drop an article in certain styles.

In Portuguese, using the article is very natural and often expected:

• o relatório
• o dossiê azul
• os separadores do projeto

So even when English might sound fine without repeating the, Portuguese often keeps the article.

Dossiê usually means a dossier, file, or folder containing documents.

In office or administrative contexts, it often refers to a compiled file of material about a case, topic, or project. In this sentence, o dossiê azul is probably a specific physical or digital file identified by the color blue.

So depending on context, you could think of it as:

• the blue dossier
• the blue file
• the blue folder

Here separadores most likely means dividers or tab dividers, especially the ones used inside a folder or binder to separate sections.

A native English speaker might first think of separators, but in this office context dividers is usually the more natural translation.

So os separadores do projeto probably means:

• the project dividers
• the divider tabs for the project
• the project section dividers

Because de + o contracts to do in Portuguese.

This is one of the most common contractions:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

So:

• os separadores do projeto = the dividers of the project / the project dividers

You should think of do as a normal built-in contraction, not as optional shortening.

Because the sentence starts with an introductory clause:

• Antes de submeteres o relatório = Before you submit the report

When this kind of time clause comes first, Portuguese normally uses a comma before the main command:

• Antes de submeteres o relatório, consulta...

It works much like English:

• Before you submit the report, check...

Yes, it is somewhat formal or administrative.

Submeter is very common in contexts like:

• submitting a report
• submitting an application
• submitting a document
• submitting work through a system

Depending on context, Portuguese might also use other verbs such as:

• entregar = hand in
• enviar = send
• apresentar = present/submit

So submeter o relatório sounds perfectly natural, especially in professional, academic, or bureaucratic settings.

Yes. Although consult is the direct equivalent, in natural English this sentence might be understood more broadly as:

• check
• look at
• refer to
• consult

In Portuguese, consultar often means to look something up or refer to a source for information, not just to ask a person for advice.

So in this sentence, consulta o dossiê azul e os separadores do projeto suggests: check/reference the blue dossier and the project dividers before submitting the report.