I have read many posts on this subject but most of them are in reference to syncing between Classic, CC, and mobile and I do not need to sync (other than between CC and the cloud). The keyword situation in CC is very frustrating having used Classic before where it was simple and intuitive; I understand this was a strategic decision by Adobe and that CC will never have the keyword setup that Classic had. What I need to understand is this: can I tag all of my photos in Classic (using flat rather than nested tags) and then migrate everything to CC? Will all of the flat tags for a specific photo migrate or only the first one? I also understand that migration is a one-time only event and cannot be repeated. (I am only using CC now and would have to purchase Classic in order to take advantage of its tagging capabilites.) If I import each Windows file folder full of photos into Classic as a separate catalog can I migrate each one independently into a single/combined catalog in CC? In other words, do I have to import all of my Windows file folders into one Classic catalog, tag them all, and THEN migrate to CC? Or, can I import each Windows file folder into Classic as an independent catalog, tag one catalog, migrate that catalog to CC and then repeat with each catalog? And, if I do the latter, can I migrate the second catalog I do from Classic into the first catalog in CC so that I can search across all photos? (FWIW, if flat tags really do migrate from Classic to CC then this would be a one-time process for me with all of my existing photos. All new photos would go directly into CC.) Thank you so much!