I'm new to Share so please excuse these stupid questions.

1) When I finish downloading a file, with the cache disappear from the cache folder? Or, do I need to manually do anything to delete the extra cache?
2) I know it's not recommended to delete cache. But, what if there's a lot? How do I get rid of them?
3) Can someone explain to me how the trigger works exactly? How is that different from searching normally?

Thanks!