finder not searching sub folders

I have a Mac air (2019) and an external hard drive (10tb seagate). I am trying to search for all jpeg files on the drive, which are held in many subfolders. When I enter "jpeg" in the search window and select "jpeg image", the only results I see are in the top level parent folder. It is search the correct drive but not the subfolders. Is there a setting I am missing?