Installed Catalina Many Things Missing
I installed Catalina on a romote SSD and find that many things are missing. I had to fill in my user account info as if I was a new user and it didn't recover any of my history. All the files that were on my High Sierra desktop have disappeared as well as files related to my account. However,I can access my Safari account and browsing history. I had two active user accounts on High Sierra (for me and wife) and neither are visible in Catalina. I do not want to start Catalina as a brand new user but obviously I'm missing something about achieving continuity from OS one to the other.
The old High Sierra account is active on my Mac and so I have all my data.
Also read/write to items in the iMac hard disk from SSD appears very slow. Does that mean that running Catalina on the SSD requires I move all relevant files to the SSD too?
iMac 27", macOS 10.15