Data Validation Abbreviation

Newbie here.

I'm trying to create a drop down list, tied to an image location on my computer.

I've successfully created a drop down list with a path to the image (C:\Users\username\Documents\PRESENTATION\LINKS), but when I click the drop down menu, the path is too long to see what the user will be selecting.

See attached "test" file for example -

the dropdown list reads -
'C:\Users\username\Documents\PRESENTATION\LINKS\image-1.jpg
'C:\Users\username\Documents\PRESENTATION\LINKS\image-2.jpg

when what I want to show is just -
'image-1
'image-2



Is this possible? Any help would be appreciated.