Skylagringen tilhører brukerkontoen.

Because -en is the definite singular ending for many masculine nouns in Bokmål.

• skylagring = cloud storage
• skylagringen = the cloud storage

So the sentence is talking about a specific cloud storage, not cloud storage in general.

Also, skylagring is a compound noun:

• sky = cloud
• lagring = storage

Together, skylagring means cloud storage.

For the same reason: brukerkontoen means the user account.

• brukerkonto = user account
• brukerkontoen = the user account

In this sentence, both things are specific:

• the cloud storage
• the user account

That is very normal in Norwegian. English might sometimes use a possessive or a less specific phrase, but Norwegian often uses the definite form when the reference is clear from context.

tilhører is the present tense of tilhøre, which means to belong to.

So:

• Skylagringen tilhører brukerkontoen = The cloud storage belongs to the user account

A useful thing to remember is that tilhøre is a fairly formal or neutral verb for ownership, connection, or membership.

Examples:

• Boken tilhører meg. = The book belongs to me.
• Dette tilhører firmaet. = This belongs to the company.

Because in Norwegian, tilhøre already includes the idea of belong to.

English uses:

• belongs to the user account

Norwegian uses:

• tilhører brukerkontoen

So brukerkontoen comes directly after the verb as its object. You do not add an extra til here.

A learner mistake would be something like:

• tilhører til brukerkontoen ❌

Correct:

• tilhører brukerkontoen ✅

Yes. It is the present tense form.

Infinitive:

• å tilhøre = to belong to

Present tense:

• tilhører = belongs / is belonging to

Norwegian present tense is simple compared with English. You use one form for all subjects:

• jeg tilhører
• du tilhører
• han/hun tilhører
• vi tilhører

There is no change like belong / belongs in English.

You could grammatically say it, but it would mean the opposite:

• Skylagringen tilhører brukerkontoen = The cloud storage belongs to the user account
• Brukerkontoen tilhører skylagringen = The user account belongs to the cloud storage

So the word order matters because it changes which noun is the subject and which is the thing it belongs to.

Pattern:

• X tilhører Y = X belongs to Y

Yes, it is grammatical and natural, especially in technical or administrative language.

It sounds a bit formal and precise, which fits well in software, account settings, or help documentation.

Depending on context, Norwegians might also say things like:

• Skylagringen er knyttet til brukerkontoen. = The cloud storage is linked to the user account.
• Skylagringen er koblet til brukerkontoen. = The cloud storage is connected to the user account.

Those alternatives focus more on connection than ownership. Tilhører clearly gives the sense of belongs to.

Yes. Norwegian sky can mean cloud, not sky in the English sense.

That often surprises English speakers.

So:

• en sky = a cloud
• skylagring = cloud storage

If you want to say the sky as in what you see above you, Norwegian usually uses himmelen.

So:

• sky = cloud
• himmel / himmelen = sky / the sky

A rough pronunciation guide for an English speaker could be:

SHOO-lahg-ring-en TIL-hur-er BROO-ker-konto-en

A few notes:

• sky in skylagring sounds more like shy / shoo-ish depending on dialect, not like English sky
• tilhører contains the Norwegian ø, which has no exact English equivalent; it is somewhat like the vowel in French bleu or German schön
• stress is usually on the first part of the compounds:
  • SKYlagringen
  • BRUKERkontoen

This is only approximate, since Norwegian pronunciation varies by dialect.

Yes, but the structure would change.

A possible rewording is:

• Brukerkontoens skylagring = the user account’s cloud storage

That is a noun phrase, not a full sentence.

If you want a full sentence, you could say:

• Skylagringen er brukerkontoens. = The cloud storage is the user account’s.

However, your original sentence with tilhører is usually clearer and more natural in many contexts:

• Skylagringen tilhører brukerkontoen.

This is standard Bokmål.

In Nynorsk, you would more likely see:

• Skylagringa høyrer til brukarkontoen.

Main differences:

• skylagringen → skylagringa
• tilhører → høyrer til
• brukerkontoen → brukarkontoen

So if you are learning Bokmål, the original sentence is exactly the kind of form you should focus on.