Cannot share files between a new Mac and older ones
I have a new iMac running Catalina that I can connect to for screen sharing, but it won't share any files in the normal way. The only folder it will show me when I connect to it from any other Mac is an external USB disk, that is shown as 'Sharepoint'. But I see nothing in that. It won't even show me my own Shared Folder. It is clearly properly networked and connected, as screen sharing works perfectly. But that is the only option I am offered when I connect to it, despite having enabled File Sharing. I've checked all the Sharing settings on the new machine. It is very puzzling.
iMac Line (2012 and Later)