Hi Dan,
Did you ever post a movie by chance. I did check your youtube tutorial channel but might have missed it. I forgot I downloaded you macro and have been cleaning up and updating my macros.
I tried your macro and it isn't finding selected macros. For what it is worth I made several macros that also rename and do sequential numbering actions with example GIFs of what they do here.
Thanks @DanThomas for all your many amazing macros! Your YouTube channel is quite fun as well.