As far as I remember, there will be a step in the onboarding process that asks if you want to restore a snapshot. Then just use the snapshot created on your Virtual machine and upload it there.
That’s correct.
Don’t panic if nothings seems to happen after you upload and start the restore process.
Just wait patiently, in the background all the containers are being downloaded and restored.
Not much is displayed in the UI in the meantime.