Hi Guys , in need of some help please with cache folder

Hi Guys , in need of some help please. What pics are stored in my Clouddrive cache folder and when is the cache updated? Eg .connect to wifi ?

The cache should be temporary storage for the app, and should be cleaned out by the app after the app finishes using it. Should be - most apps don't handle their caches right, so they get filled with just about everything. At any time. Connected or not.