Normally in grid view only an index number is shown. When you hoover an image, you’ll see the filename and date taken/capture date. When selecting images based on filename this becomes a nightmare if you need to wait until the tooltip is showing.
Fortunately, there’s an option to show the filename in the grid view.
View > View options (ctrl + J) > tab Grid view “compact cell extras’ > check ‘Top label’ > choose copy name of file base name.