Missing or Corrupted File?

My bad!  I never use that option to import and forgot the wording.

So, here is what I think you need to do.:

• Get rid of  the missing files problem. 
• If you are not concerned about removing these files from your catalog, simply go through the Find>All Missing Files process, press Ctrl+A to select all of them, and then hit Delete. 
• If you want to retain all or some of the missing files in the catalog, we need to figure out where they are.  So, first, select one of the files and go to the Information panel on the right of the window.  The Organizer thinks that the file should be in the folder displayed under the Location link.  Either click on the link to open the location in File Explorer, or hover over the path name if it is not fully visible and the full path will be displayed.  Hopefully, this will give you some clue as to why the file is no longer in that location.  At some point you must have either moved or renamed the file outside of the Organizer.   (In future, NEVER conduct file operations outside of the Organizer.)

• To reconnect the files, do a search of your computer for the file name to see whether it actually exists under the Organizer's name.  As noted in my earlier post, the file utility Everything is really fast at this, but if you have properly indexed your files under Windows, that is fine too.  If you can find the file (either under its original name or under a renaming of the file), double-click on the missing file in the Organizer grid and navigate to its path using the Browse button.  As you have already experienced, waiting for the Organizer to find the location automatically takes forever.  And if you have renamed the file, it may never be found.
• With respect to the iCloud photos, how are you downloading these to your computer?  Are you using the iCloud for Windows application?  If so, the missing video may not actually be stored on your computer but is still in the iCloud.
• Once there are no longer any missing files in your catalog, go to File>Manage Catalogs and perform a Repair and Optimize on your active catalog.  Proceed with these operations even if a message appears that says no issues were found.

Hope this helps.

Jim, you said:  Lately, when I've gone to "Get Photos and Videos from Files and Folders" within PSE, it often freezes up. . . . This morning it got stuck on "D:/jim/PSE Test.IMG_4019_HEVC.MOV" for about an hour

It's not clear to me what you were doing at the time or exactly what was stuck.  Please be exact in your description of what import command and what program you are talking about.  I'm assuming that you are talking about the Elements Organizer and the Import>From Files and Folders command. But your description is closer to the Add Media> commands in Premiere Elements.

If you were using the Organizer's Import command, were you selecting more than one folder?  Did your folder selection include the D:/jim/ folder - because that's where you say the video file got stuck?  And if that is the case, and you cannot find the problem .mov file, then something seems to be corrupt.  But I cannot tell whether the corruption is in your OS or in the Organizer's catalog.  Once you give some more details, perhaps I can be more helpful.

And how are you searching for the file?  I recommend getting a free utility called Everything.  It is very fast and flexible in conducting searches for files.  Now having said that, it occurs to me that the MOV file was once imported into your catalog but you deleted it outside of the Organizer.  This would make the file missing and could create the problem you have partially described.  I suggest you do one or both of the following:

• In the Organizer, press Shift+Ctrl+K which will bring up the find by filename search box.  Type in HEVC.MOV.  Does the problem file appear in the grid?  And if so, if you double-click on it does it show as missing?
• In the Organizer, go to the Find menu and select All Missing Files.  Depending on the size of your catalog, this search may take a minute or two.  Do any files show up in the grid?

The file name indicates it is a video.  If it was shot in the HDR color space, it cannot be imported into Elements 2024.

The name also indicates that it has been renamed from the original in some manner.  PSE Test.IMG_4019_HEVC.MOV.  Does this ring any bells about you doing some kind of test e.g. renaming the files or something?