Hello, not sure if im in the correct place, but i recently upgraded from revolution OS which is a miui based rom i believe, i went from android 8.1 to 9, but the system storage is at 74GB and i cant see how to delete anything from it or even look at it. i have a 128gb sd card, and the system sees it i nthe settings but it shows i have 30gb free of 128, and the system storage is 74gb. deep clean doesnt show anything large either other then general photos and some vids i have on the phone. but these are all within the "pictures , videos" storage section anyway. how do i access the system storage and delete it to free up space?