The cache-clearing trapAnd why the obvious does nothingCredit: Brandon / MakeUseOfWhat about clearing app storage and cache on individual apps--will that reduce the size of Android's "Sysetm storage"? What's actually inside "System"And what Google won't tell youCredit: Brandon / MakeUseOfFrom the System > Storage screen here, you can see a breakdown of what is using your storage space. The point is that Google doesn't want you to be able to remove or reduce these nearly 30GB of system files. I have no idea why this happened (why would the System storage drop, only to later increase beyond the baseline? ), but my best guess is that when I deleted AI Core app data, which is probably not a thorough delete of all AI Core components, I also triggered a re-download of AI Core components.