Intermediate images are not stored on the file system, only the full size version is retained. In fact, the VIP Go Files Service can generate images custom sizes on the fly. In other words, when uploading an image, no
medium or other similar versions are generated.
This has the benefit of allowing a change to the application (e.g. a theme change) to completely change what crops, resizing, effects, etc are applied to the source images without having to process all source images to produce these intermediate images in advance. It all happens just in time as requests come in, are processed, and then cached on the VIP Go edge.