See some material...
Thanks Ruben and Logan for the links.
I viewed them all and didn’t find anything I did wrong.
The files got copied to the right location with the right file names.
I checked the list of external references in all the parts before I did the pack and go.
In some of the new all the external references are looking at the old parts.
In some all of the external references are good.
And in some it is a mix, even within a single sketch.
I don’t know if my antivirus or network firewall could mess it up.