Just to clarify, from my old Kindle I had imported the collections previously. I had read a while back that I need to create the collections on the device prior to transfering them to the new device.
So I have a Calibre library with several imported collections and those same corresponding collections on my new Kindle. I selected ONLY those books that had a collection title in the collection column and sent them to the device. But they never went into the corresponding collection...
There has to be a way, otherwise, what's the point of having this plugin?