Imported Image folders not showing up in folders.

Ok I reviewed the thread, in Rob's post Sept 22nd he indicated that you had not selected any images to import. So the files were not imported.

The advice I provided to synchronize the parent folder prompted the import which in essence is the same as utilizing the "Add option in the import dialog. Hopes this clarification the situation.

A reliable source of info on Lightroom Classic, see the link below.

https://jkost.com/blog/lightroom-training-videos

Have been away. Thanks to others in the conversation.

For screen-clips: Yes, use the [Insert Photos] icon that appears above your message window when you post.

Now my take on your recent screen-clips.

1) You ARE importing form the SSD (1TB Drive) and not a camera SD card. This is what your import dialog 'Source' tells me-  "SANDISK SSD 1TB" (including sub-folders)

2) As suggested by @GoldingD  - When the files already exist on the 1TB Drive (in the COUGAR & PANTHER CREEK FALLS sub-folder) you should be using the [ADD] option at the top of the Import window.

By setting a [Copy] option with the exact same folder in the Destination panel you are trying to 'copy' the files to the same folder location which I guess LrC is refusing to do.

For files on a camera SD card- Use [COPY].   (But NOT if they are already on the SSD!)

For files on a connected (internal or external) hard-drive - Use [ADD].

If and when you use the [ADD] option to import to the catalog, you would then Rename the files AFTER they have been imported, if desired. (Using your rename template).

And can i suggest you read the Lightroom-Classic Free LIGHTROOM QUEEN eBOOKs 

The folder (name hidden) that contains the 19 imported images shows in the very first screen capture in your original post. See the clip below.

Right-click on that folder and there should be an option to "show parent folder" click on that option to display the parent.

Next, post a screen capture so we can see the parent folder.

At James, are you by chance creating an individual Catalog for each import? 
Just a thought out of the box.

The thread on your posting has gotten long, so the following might have been brought up, my apology's if as such.

Try an alternative import process/option. This to see if the problem persists with fewer variables. Specifically using Add instead of copy.

1. Outside of LrC, using your MACOS Finder, create the desired folder that you want your photos in
2. Using Finder, copy the desired images to that folder
3. In LrC, in the Import Screen, with the Copy option still selected, turn off into subfolders, and in destination select the folder in the above steps (this to simplify and verify folder location, you may change back later). I state this as a bit if overkill, thing is Add can take on issues with incorrect values selected in Copy, usually this occurs if a previous destination is no longer valid.
4. Change from Copy, to Add, the right side panel will simplify, as destination should not be a question
5. Select the correct images, and import.

What occurs?

If I can throw in some comments based on your screen-clips:

1. You do not have any of the 'new' images checked to Import. They need to be ticked in the small box if they are to be imported.  (Select all, check one box)

2. You do not need to specify 'Into a sub-folder' if you instead-

3. Highlight the exact folder where you want the files to be copied into.

 I quit Lightroom Classic and eject SSD drive, give it a few seconds and unplug it

And you are absolutely sure that the import was complete before ejecting that SSD?

Once that import was started, the Library module should have appeared, and the import progress would have been shown top left.

Deleted, after reading, rereading, and rereading, I came to the conclusion that my reply was just so so wrong.

I guess I am going to be picky here to help my brain digest the problem, and ask you to re-write the problem description. One very long paragraph with lots of shouting (lots of capital letters) is very difficult to read, and I haven't even gotten past the first two sentences before I decided not to read further because it was so difficult to read in this format. Please create reasonable paragraphs and explain the problem with less shouting.

Also, it would be very helpful if you could use the "Insert Photos" icon to include your screen captures, as my web browser cannot open your attachments.