Everything seems to go well with no error messages. However, the vast majority of the attachments don't get imported.
In my vB attachments directory there are number subdirectories from "1" to say "39448". Each with a few numbered files with extensions .thumb and .attach. I should have thousands if not 10s of thousands of attachments on my 1M post forum.
When I selected import attachments, process only took about 15 minutes during which I could watch the doneness percentage climb steadily from 0 to 100%.
In my new XenForo attachments directory there is only one subdirectory and it's labeled "0". In that directory there are about 250 small jpg's. The images are all thumbnail sized.
So why didn't it process my attachments? Any suggestions?