Updating specific record using Update.Set & Update.Push in nested collections in MongoDB

Question

I have the following entities:

public class Profile
{
   public Guid Id {get; private set;}
   public ICollection<User> Users {get; protected set;}
}

public class User
{
   public Guid Id {get; private set;}
   public ICollection<Address> Addresses {get; protected set;}
}

public class Address
{
   public Guid Id {get; private set;}
   public string AddressProperty Address {get;set;}
}

We have a parent collection called Profiles and other classes are nested inside this document.

Let's take a look at the levels of nested collection:

One Profile can have -> multiple Users where each user can have -> multiple addresses

Now let's look at Update code for User collection:

public async Task<bool> UpdateUser(Guid profileId, User userData)
{
var dbContext = await GetDbContextAsync();
var collection = dbContext.Collection<Profile>();

var record = await collection.UpdateOneAsync(
                            Builders<Profile>.Filter.Eq(rec => rec.Id, profileId),
                            Builders<Profile>.Update.Set(x => x.Users.ElementAt(-1), userData)
                            );
            
return record.IsAcknowledged;
}

The above code works fine.

Where I am stuck at is while trying to update Address inside a User using a separate operation like UpdateAddress to which we pass the UserId.

How do we write Update.Set for a collection (Addresses) which is inside a collection (Users) inside another one (Profiles) where Profiles is the parent document?