Snapshot from individual site (without multisite) to a single site in multisite

Hello, I have do an snapshot in (a site without multisite) and I want to import it as it is to (a single site inside a multisite network).
How can I do it without override all sites? I tried once with "All in one multisite import" and when importing it it erased everything. I want to do it right this time.
I write you because even if I activate snapshot pro for the network, i cannot see it in the site /decnika. Is this normal? Thanks.