This data-driven category is filled from the metadata in your files.
Do the files only fail to show under location, or also under country and city?
Check the location data for these files in the Metadata Panel to be sure.
I have also read somewhere that I can add a symbol to the photos assigned with a category. How do I do that?
Assigned to any category or specific categories?
Basically, you setup a File Window layout with a custom template, which allows you to process variables. And display text or an icon if a file is assigned to a category.
If you search this community, you will find a couple of examples, especially from
user sinus.
The
IMatch Knowledge Base has the
Use Custom Icons in the File Window article which explains how to display icons in the file window.
The KB article shows how to display an icon if a file has keywords. You can apply the same logic, just with a category variable to display an icon when the file is assigned you the category.