It seems as if the average response time on this particular thread is about every 3-4 years. ???? Still, even in 2018, this post and this reply by Ia was very helpful.
I have one more point to add:
I found out it doesn’t matter what image you put in between the gaps. I just tested this with any random image and pressed “ripple delete,” and it works. This is a relief after spending hours trying to find solutions to common, mundane editing problems in Pr.
Thank you! Oh, and by the way, I’m new here. And I do find this site useful been referring to it for years.