How to migrate a single Wordpress site to a multisite network using Snapshot

Is this possible with Snapshot:

Migrate (backup and restore) a single Wordpress site - no connection to the Multisite, in fact just a single WP site (all pages, posts, media library, and custom posts) to a Wordpress Multisite (create a new site within it)?

A few questions:

1. Is that possible?

2. How to do it?

3. If so, would the images still be "connected" to the posts/custom posts when restored in the Multisite network?

4. If this isn't possible, is there a Wordpress plugin that can do this.