Update #2 – I found that all of the existing downloads had been set to a status of “Scheduled”, with a to-be-published time a couple of hours in the future. I’m not sure why that happened, but I simply waited a couple of hours and the files now are showing on the pages where I have included the category shortcodes.
Now that everything is showing, I’m finding that my order field = id in the shortcodes isn’t putting things in the intended order anymore because the ID’s were reassigned; everything is jumbled up. But at least the content is there.