Moved folders and files to a different drive, but most are not showing up in My Folders

I’m trying to clear space on my C drive, so I moved some photos to my D drive, which is a 1 TB internal drive. I did this successfully a few times, doing the move completely within the 2018 Photoshop Elements Organizer. But today when I tried that, I got an error message at the 100% mark, telling me that that a file “could not be renamed,” and the only option on that message was to cancel. So I then moved the files using File Explorer, figuring I could then reconnect them in the Organizer. That was about an hour ago, and it’s still not quite right. I did reconnect them, their tags are still there, I can see the files by selecting the tag. But most of the files do not appear in My Folders, which I often use to display my files. There are 4 subfolders in the folder that I moved. Two of the subfolders do not appear in My Folders. The other two folders are listed, but most of the files in those folders do not display when I click on the folder name. I’ve tried reimporting the media, which the Organizer does, but says that x number of files were skipped import because they are already in the catalog. That makes sense, but those are the files that don’t appear when I click on the folder name in My Folders. Any ideas on how I can fix what My Folders lists and displays?