[NTG-context] Recursive search in resources folder

Dear list, In a project I received, there are a lot of images distributed in several folders like: figures/folder1 ... figures/folderN Which is the syntax for ConTeXt to find recursevely all images under the folder figures in the main folder of the project? I tried \setupexternalfigures[location=global,directory=figures] then ConTeXt finds the images in the figures folder, but not in the subfolders folder1, folder2, ... folderN TIA Marcus Vinicius