Need Help With Snapshot Migration

My support request seems to have fallen through the cracks -
https://premium.wpmudev.org/forums/topic/how-to-migrate-a-single-wordpress-site-to-a-multisite-network-using-snapshot#post-790718

I'm trying to migrate a single site Wordpress to a multisite. I followed through with the instructions from the previous thread, but as noted, none of the files in the media library were backed up to the backup file - only the sql files for the database.

Here's the screenshot again of the settings I chose.

Thanks,

Steve