Site migration using Snapshot Pro getting stuck......

Hi

We are trying to migrate a single install into one of our multisite installs.

I've followed the instructions in this WPMUDev blog;

https://premium.wpmudev.org/blog/easy-migration-snapshot/

The process get's started and then stops with an error message. It's telling me to check the log - but I cannot find any log.

I've granted support access - could you help please?

Thanks!

James.