keras flow_from_directory returns 0 images
Keras generator alway looks for subfolders (representing the classes). Images insight the subfolders are associated with a class.

So whan you work on C:\images\ and you have two classes, say C1, C2, you need to create subfolders C:\images\C1\ and C:\images\C2\. The directory insight the generator function should point to C:\images\.

See this post for the case of image prediction: https://stackoverflow.com/a/55991598/9524424