Thank you to Rick H. and Steve S.
Steve's method below solved my issue.
Apparently I was clicking done/ RTN before trying to save.
I did get the mrk file to save to my working dir.
Strange thing is that I wasn't able to view the marked up model with PV
express?
BTW - Are people actually using that mark up functionality?
If you can please share how are you doing that and for what purposes?
Thanks again to the group.
Best regards,
tw