I have a CSOM console app that uploads files to a library, then it creates a lookup field in another list and also adds lookups to the files in my library.

The following code adds a single item in the lookup:

```
FieldLookupValue flv = new FieldLookupValue() { LookupId = Convert.ToInt32(attachmentFile.Id) };
listItem["MyAttachments"] = flv;

```

How can i modify this to add multiple FieldLookupValue's?